Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c4aa5b2784c9f1…

MALICIOUS

PDF

38.6 KB Created: 2020-10-15 05:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c2c8503eb60b9febf4e7f739d106eaaa SHA-1: 1ff5512f6cc303fbabde5a3ec6ded84277e1a25c SHA-256: b3c4aa5b2784c9f1c871983b8c19469f783d0290f3d1d6bbd0f2a5bec6c9f234
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with a primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to "Rheumatoid arthritis treatment pdf" and the authoring application, suggesting a lure to a malicious site. The presence of many external PDF links, including benign ones on Shopify, indicates a link farm strategy to obscure the malicious destination.

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://cctraff.ru/strik?keyword=rheumatoid+arthritis+treatment+pdf In PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3355978.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/pokobu-pidoror-pekirez.pdfIn PDF document text
    • https://site-1040428.mozfiles.com/files/1040428/tenejagafatasawifamat.pdfIn PDF document text
    • https://site-1040037.mozfiles.com/files/1040037/sikagukuraniram.pdfIn PDF document text
    • https://site-1040563.mozfiles.com/files/1040563/tukol.pdfIn PDF document text
    • https://site-1048488.mozfiles.com/files/1048488/savalaxolexepubi.pdfIn PDF document text
    • https://site-1041499.mozfiles.com/files/1041499/51995442923.pdfIn PDF document text
    • https://site-1038595.mozfiles.com/files/1038595/fuguvuwe.pdfIn PDF document text
    • https://site-1040129.mozfiles.com/files/1040129/printable_misplaced_modifier_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0487/6727/files/apk_ytd_video_downloader.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4532/8808/files/gegalevuzepipasafo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7865/7212/files/pathfinder_use_magic_device_staff.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2192/1177/files/nike_golf_donation_request.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2140/0745/files/difference_between_lan_man_and_wan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9582/5826/files/rattlesnake_in_french.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4396/5086/files/fexoxiza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9552/6049/files/proto_rize_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4915/6757/files/58621273016.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_off00004dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DC5 5136 bytes
SHA-256: acd7ba920977d2288a3e42b31763a19c7cd7926d5fd9fc8ef821a478c15b3059
font_01_sfnt_off00005f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F13 9408 bytes
SHA-256: bb1d512fffbe08f8f9c2b1d82640792ee773c39c2c8f19b77993e9509850740a
font_02_sfnt_off00007f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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