Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1e8cb138c5e392…

MALICIOUS

PDF

68.7 KB Created: 2020-09-09 13:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a1cfaa36de0b19facf12010765494682 SHA-1: da10dac2c181fcf5fc3647c3c74bcef282a95c77 SHA-256: 7e1e8cb138c5e3922c8292cc63aeb0ae159552afdd0933a1e887ff44f334faf4
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous external links, many pointing to benign PDFs, suggests a link farm or SEO poisoning tactic to distribute the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=commutative+property+of+addition+worksheets+with+answers In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_1ae9e16d59ed47b1b9ebd420543c6745.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cb4a18_d1ba86273736449bb6d7e7388a0d5c04.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6a44d8_0e799320de6c44c29ac84a022d39711a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/85c99c_4bfd5099a7a84b1a92c595693fc61b12.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/tuvuxufixozuxazisejup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1217/7572/files/kezudumutuzesupofujegip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6300/8664/files/health_economics_jay_bhattacharya.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4921/2309/files/kegepoladiwepubanarega.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2428/4824/files/60884986564.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e4ff69_980f40002c0c4816bbf0386f5dddd3fe.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5c139a_88b4a36f44fe4e87bd34c248e9f341a2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/93c935_0b44b805a5984074b6d2d22ac06d8f7d.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/4213/8262/files/ethyl_alcohol_toxicity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7940/1623/files/xewowobilagujebumepawu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3331/3958/files/9865782172.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E8 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off0000cde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE2 5472 bytes
SHA-256: 4cbc1aa99f844e231d9a4fe8451f75a13b3f6d17cbee1ae8b476373276cab9ac
font_02_sfnt_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 10292 bytes
SHA-256: 0b48fa5b4db3689a0708f47b56b2d4d0be28d789f8dd38b826169d98eed0e918

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