Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cef9a99fec76c57…

MALICIOUS

PDF

44.1 KB Created: 2020-08-21 09:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c510acf77045a25ca03dea2db94b8bc2 SHA-1: f0c015086725b6d8f26c883a0ed109f83d3c0cb2 SHA-256: 6cef9a99fec76c57e2359f9de6b7820efc7978a1c21d2cd93e2878e59d0c8927
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'firewall access control list template' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.com/pify?keyword=firewall+access+control+list+template
    • http://weduje.lulietbakery.com/uploads/1/3/1/0/131070382/3baab01e23d.pdf
    • http://files.umassasce.com/uploads/1/3/0/8/130874431/gewinosumuto_lunodosujo_gewomalozi.pdf
    • http://files.citykidzmag.com/uploads/1/3/1/4/131453522/b3bef15785d.pdf
    • http://files.olivetcongregational.org/uploads/1/3/1/4/131454316/7874457.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/68278444087.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/23916132156.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57896919986.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/benubojebexoreloruva.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2512/files/84783469218.pdf
    • https://cdn.shopify.com/s/files/1/0428/5490/8071/files/febobunekolixalesokifenus.pdf
    • https://cdn.shopify.com/s/files/1/0430/4066/9849/files/hadoop_admin_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7873/files/minecraft_coordinates_command.pdf
    • https://cdn.shopify.com/s/files/1/0434/1671/5429/files/80483742343.pdf
    • https://cdn.shopify.com/s/files/1/0429/2172/2015/files/xopikizojigu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4276/4962/files/telescopic_alidade.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/fusionner_2_sans_logiciel.pdf
    • https://cdn.shopify.com/s/files/1/0433/4983/5930/files/62428718605.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_off00006e5a.bin
912c7371e8a4a47fc5efe47e25be0992583a232920005aa9057534d6a39cdec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5A 5128 bytes
font_01_sfnt_off00007fc1.bin
de7fbc3f7ae2519829e537f47f81157551876ccebc1d480ef7736e562403a4d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC1 10312 bytes

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