Malicious PDF — malware analysis report

Static analysis result for SHA-256 4097cce125da6285…

MALICIOUS

PDF

44.5 KB Created: 2020-08-14 13:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa4bf11dc19d74c436955bfa13e7ddda SHA-1: 249b80b2913bb52ee44909b502b3dc6c2f9b5a26 SHA-256: 4097cce125da628511ea9c7924d7b427301bb58aa737f20d55eb3a4d6a3c4da1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm for SEO manipulation or to obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/wb?keyword=derecho%20a%20la%20intimidad%20y%20privacidad%20pdf'. The document body, though heavily obfuscated, contains this URL and references to PDF documents, reinforcing the link farm and redirection attack pattern. No scripts were extracted from this sample.

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/wb?keyword=derecho%20a%20la%20intimidad%20y%20privacidad%20pdf
    • http://files.healthysubtexts.org/uploads/1/3/1/4/131406817/divokibobibubutud.pdf
    • http://files.msubsm.com/uploads/1/3/0/8/130814126/802616.pdf
    • http://files.nadialouderback.com/uploads/1/3/1/4/131406811/7f588a3200c.pdf
    • http://files.618bass.com/uploads/1/3/1/4/131453007/didirinid-vibemeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/refitapobofubogiwimubik.pdf
    • https://cdn.shopify.com/s/files/1/0439/8468/3166/files/9017147919.pdf
    • https://cdn.shopify.com/s/files/1/0435/7967/0689/files/pafejafefowoti.pdf
    • https://cdn.shopify.com/s/files/1/0436/2646/3385/files/zegavowolirir.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/98864683460.pdf
    • https://cdn.shopify.com/s/files/1/0447/2268/4058/files/bmt_college_prospectus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dazexirorojukulovamedifuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/0900/5978/files/pepunojuxene.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/free_maths_worksheets_for_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0439/8972/9438/files/florida_arrests_org_brevard.pdf
    • https://cdn.shopify.com/s/files/1/0428/5857/8086/files/95350745984.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000609e.bin
09b0ce05978c6f819f1db30a4506f475593426b6149d015c0a3336cf6124b544		 pdf-font-stream PDF embedded font (sfnt) at offset 0x609E 5164 bytes
font_01_sfnt_off00007208.bin
3f1583f68385c9931dd50bd837165a52f0d6096e0f3a976314f0a6a220c33675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7208 10840 bytes
font_02_sfnt_off00009532.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9532 4324 bytes

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