Malicious PDF — malware analysis report

Static analysis result for SHA-256 687043d3022a54b8…

MALICIOUS

PDF

44.1 KB Created: 2020-08-24 11:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96b14832160f07755fdeec2bb903c2da SHA-1: 53cef7b6b94d1a6f1e4440695383581b6b005dc2 SHA-256: 687043d3022a54b8a54ba53837cfed1eecbf88784f4436242bc67ea123f02e30
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be link farm infrastructure designed for SEO poisoning. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

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=riddles+and+answers+for+adults+easy
    • http://ketator.heritagefloristcortland.com/uploads/1/3/1/4/131453558/6172085.pdf
    • http://files.holisticmassagenow.com/uploads/1/3/1/3/131380612/54fcf210c72e.pdf
    • http://fubijebo.bantrybayponytrekking.com/uploads/1/3/0/8/130814088/mojixanafavobosade.pdf
    • http://files.speechoregon.org/uploads/1/3/0/8/130814596/bojilepifofib.pdf
    • http://files.zendope.com/uploads/1/3/2/6/132682471/miset.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5650/3707/files/64798816131.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0250/files/18516625387.pdf
    • https://cdn.shopify.com/s/files/1/0440/3986/4485/files/vopitaxiwepizi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9380/1625/files/71560007504.pdf
    • https://cdn.shopify.com/s/files/1/0435/8671/5805/files/valevejupitilotawatil.pdf
    • https://cdn.shopify.com/s/files/1/0435/1492/1112/files/bubibakadopizowitifes.pdf
    • https://cdn.shopify.com/s/files/1/0434/9467/0498/files/career_development_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3697/files/dadezokibegad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jenodilibaxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0323/8811/files/16940921163.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/datumaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/65878970573.pdf
    • https://cdn.shopify.com/s/files/1/0429/1677/4054/files/a_level_african_history_notes.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006efd.bin
0a91f29f61ac4ffb8423bd69b65dddd7a80f2c1ea7e9a9cee014bdf7119c82ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFD 5104 bytes
font_01_sfnt_off00008078.bin
02e8ecdeb95f3c402cd0d22b3b30841a0729552df7b5cca4d6ee79348918b396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8078 10044 bytes

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