Malicious PDF — malware analysis report

Static analysis result for SHA-256 071c3a3e7379fa58…

MALICIOUS

PDF

57.0 KB Created: 2020-10-26 12:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 93089f90fc0473dbed3375d93b7a5a88 SHA-1: 2bc5004c661878e6871541acf44b8edd0f28b270 SHA-256: 071c3a3e7379fa5872822de354209392bf5c6de5a6231b8aa268d88002d127cd
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, pointing to the URL https://ttraff.ru/pify?keyword=gajendra+moksha+stotram+in+telugu+pdf. This URL is likely used to redirect users to a phishing site or to download a second-stage payload. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=gajendra+moksha+stotram+in+telugu+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_5f90eaa8a6f83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f871d50e0349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_5f8ffc205db8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5f9639481f079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_5f934b14de3f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f8d7dd320d99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5f8df66273187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f91e1a9daf23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4022402-57de-4dcf-b713-53f474a3753f/78473267318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65515de4-ecaf-4367-9ccc-c88ef7332d19/54581092761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2cac4f7-c00f-4d8e-aaba-20c58161356b/sekorozujezufokufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d222d1-cb6a-4144-b6ce-a0183c7b2faf/basodexuv.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/552358358.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9261/6388/files/wcpss_calendar_2020-21.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/working_principle_of_gas_chromatography.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4040/6684/files/tubagu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/7756/7132/files/jabopavoginasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3960/3360/files/kovujudoposajekun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6290/6017/files/strategy_formulation_answers_the_question.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7819/8464/files/times_table_4_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4415/4791/files/57464452061.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7981/0206/files/generac_power_washer_instructions.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7167 5628 bytes
SHA-256: 184782ef252f3d972c3788de10bc72e447346516a6ea7d2ded95bac07cd46d6b
font_01_sfnt_off00008477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8477 11296 bytes
SHA-256: 5d2d3eb437a6d50e81b617c0ce095fa53cf33f1e01f33127a478666db768fedd
font_02_sfnt_off0000aac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAC9 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140
font_03_sfnt_off0000bfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCB 5984 bytes
SHA-256: ec6dda22b1914008f82a38b244ffec7fc772b1206b004422f4c1640cc4e33634