Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ebc02fc228d38f…

MALICIOUS

PDF

48.7 KB Created: 2020-10-17 16:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e6b0536a101898cd3aa74978cfb5caeb SHA-1: abffa40bb22430b407e2e0d642cc04eede57bdeb SHA-256: 91ebc02fc228d38f12affbd3cce0abe6b61c73241cc0c1fb80cc7b519ea18838
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to link farms hosted on weebly.com, which are likely used to manipulate search engine rankings. One critical heuristic indicates a direct link to known malicious redirector infrastructure at 'https://cctraff.ru/strik?keyword=my+bloody+life+free+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary purpose is to redirect users to potentially harmful content.

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=my+bloody+life+free+pdf In PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/devuxupujikeninaferi.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/1aff6c6c.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/limekawavuv-fukif.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/2410368.pdfIn PDF document text
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/5003c4730cbee51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f87267c3498a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f8a2125ab456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5f89373080088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f8a1f7d74264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f8854dbf0337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f8a803f18260.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/1/0437/7765/4935/files/radian_graphing_calculator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3874/2440/files/does_hair_dye_expire_garnier.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5130/9473/files/85292857369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147b8ed7-266d-4693-9884-1ede3a7480e8/90281203733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0386335-957f-4e4d-b5f5-748363718a4c/33737611359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d051dba-28ab-4cef-880d-94117e7fd7ba/60551379575.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5417/7185/files/group_verbs_list_with_bangla_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/1207/9006/files/vumelubojif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3385/6664/files/17716146101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/2131/2671/files/xuliwuwukunaxaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9748/3173/files/oakley_kitchen_sink_backpack_red.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_off000075a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A1 4496 bytes
SHA-256: 6497257d8753a1efc168202c2349d629f3fbcada8ba7296260cc7d0caf3b3296
font_01_sfnt_off000084f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F3 9920 bytes
SHA-256: c83fe68ef9142741920103baa83ab768b467c3268a0e5a4a871ed2474e7c5a27
font_02_sfnt_off0000a6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6DF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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