Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55fac6b854f4155…

MALICIOUS

PDF

45.2 KB Created: 2020-07-30 07:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e00d74203ec4482902fe9cd0cee77edb SHA-1: 45ceb102bc77f71152f5fcdf2ecfe23777de2ac8 SHA-256: c55fac6b854f415505c239fc9e0a2aa19ade190be6aa33a4f60fa4fb037b7ce5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and 'PDF_SEO_LINK_FARM' indicates a large number of external links, likely for SEO manipulation or to host further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document body and embedded URLs suggest a phishing or redirection attack.

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.cc/pify?keyword=believers+authority+by+kenneth+hagin+pdf
    • http://files.butternutbrookequinecenter.com/uploads/1/3/1/6/131606291/2540467.pdf
    • http://files.oxfordsculptors.org/uploads/1/3/0/7/130739806/256316.pdf
    • http://files.palmettoautomeet.com/uploads/1/3/1/8/131857305/1066846.pdf
    • http://files.quilteddesires.com/uploads/1/3/1/4/131437319/6042775.pdf
    • http://files.palmettoautomeet.com/uploads/1/3/1/8/131857305/1066846
    • https://cdn.shopify.com/s/files/1/0433/0081/5006/files/96460250348.pdf
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/86458049977.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/26767434151.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/81147005948.pdf
    • https://cdn.shopify.com/s/files/1/0434/8788/7526/files/42135094858.pdf
    • https://cdn.shopify.com/s/files/1/0434/0622/9654/files/90936265550.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/fevotujaruruluw.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/wobitaputizarasosulozur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/joxojoxabexivowukerimixak.pdf
    • https://cdn.shopify.com/s/files/1/0437/1959/0056/files/lojadipofoxegula.pdf
    • https://cdn.shopify.com/s/files/1/0430/6416/4506/files/wabefenidik.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/92882660767.pdf
    • https://cdn.shopify.com/s/files/1/0428/1224/4134/files/vibewedokikatekerivuzilo.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_off000070aa.bin
230df6c3286284cf9220f5cd70640f371a8ad1d8848388827c596f8baa1fc0ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70AA 5600 bytes
font_01_sfnt_off000083bb.bin
dd3f8ff277720fa0d9b5d2d763c3f4e462ed0aac8793ed8d4921bab3cdac0835		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83BB 10444 bytes

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