Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ccc05a3b9f456f…

MALICIOUS

PDF

52.1 KB Created: 2020-08-12 12:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb4518c8fecad12cb24cc0d93a03ab93 SHA-1: 4c37afa834af229b84bddbe8758ccb16d2025a79 SHA-256: 67ccc05a3b9f456f635291ac67509aa90370adaac308073a8197dc055e04a012
170 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, suggesting an attempt to lead the user to a malicious site. The presence of urgency lures and a download button further supports a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=bankers+adda+ibps+clerk+mock+test+pdf
    • http://lerujob.thewheelcaravanpark.co.uk/uploads/1/3/0/8/130873995/45b34b9e149588d.pdf
    • http://files.ladyartisanltd.com/uploads/1/3/1/3/131383727/3402827.pdf
    • http://files.theangelwhisperer.co.uk/uploads/1/3/0/7/130739945/8800117.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/21287282402.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4885/files/minimalismo_gastronomico.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16949815227.pdf
    • https://cdn.shopify.com/s/files/1/0431/1040/0153/files/70424503210.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/xomunaxaridukefezazuwo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6876/5861/files/bufodumexupav.pdf
    • https://cdn.shopify.com/s/files/1/0433/3980/8922/files/77668454463.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/86244107944.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/95549558851.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/miveguxuxububepevomozit.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_off00008d5c.bin
b80d8f868a7e494f922e0351964339071479f7e3d0b8f7eccd8869e11632a291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5C 5552 bytes
font_01_sfnt_off0000a01e.bin
fe066d3a9b4641e087e1d888d2ee4aeed20bf3301d17fc06ce446d8680eeb5dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA01E 10480 bytes

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