Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4507728215c919…

MALICIOUS

PDF

54.1 KB Created: 2020-08-10 09:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8b3529224c276bf1e690f9820732ef0 SHA-1: e36bd0c5217069f8671a0debcd37cac0562f5139 SHA-256: 9d4507728215c91909d20872244c6cf62173d79bfb80316800c7f33a23b8ec52
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=employee+appraisal+sample+pdf`. Another critical heuristic flagged the PDF for containing a mass external PDF link farm, suggesting a spam or SEO poisoning campaign. The document body, though partially corrupted, contains text related to 'Employee appraisal sample pdf', indicating a lure to encourage users to click the malicious link. 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/pify?keyword=employee+appraisal+sample+pdf
    • http://files.johnthrasherfineart.com/uploads/1/3/1/3/131381881/mijoxekenufo.pdf
    • http://files.forsythtavern.com/uploads/1/3/2/6/132681976/1283824.pdf
    • http://bogikabov.hoosierphotoorganizer.com/uploads/1/3/2/6/132681352/xebovedovilaveb-xunulunuxikaz.pdf
    • http://files.tiffanyshocklee.com/uploads/1/3/2/6/132682134/fikuxen-barifegax-saxurafe.pdf
    • http://files.carinawingel.com/uploads/1/3/0/7/130740298/801031.pdf
    • https://cdn.shopify.com/s/files/1/0436/1660/0227/files/dobosegekazogiketujiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/2809/3856/files/75259622459.pdf
    • https://cdn.shopify.com/s/files/1/0435/7246/1727/files/40562692078.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/vabufa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/fogodimujobume.pdf
    • https://cdn.shopify.com/s/files/1/0430/6917/8017/files/53719111472.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85484739365.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5799/files/cancel_plex_pass.pdf
    • https://cdn.shopify.com/s/files/1/0449/2935/1835/files/esl_speaking_questions_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/29389358048.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tokavurovapipemekimisam.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009649.bin
21c6aed897309a60607979e3a6e180c5e0ff765f277d74d89b9cb2602af9d497		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9649 5244 bytes
font_01_sfnt_off0000a811.bin
0a052c7538b5ff51b478ac06be3dbeff70e1b0c3a7c6168382e2b14772a67b80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA811 10272 bytes

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