Malicious PDF — malware analysis report

Static analysis result for SHA-256 842be107d91fd25b…

MALICIOUS

PDF

43.5 KB Created: 2020-08-19 13:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46812186e31bbea24bf429eb1d26b85b SHA-1: 25f44fae543924473754c6333088d0abee123777 SHA-256: 842be107d91fd25bd28d1943b5ba88f9269eefb8523ef03cef2ad5b0d44643fa
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a "Bootstrap template for profile page", likely a lure to encourage clicks. The presence of many external PDF links, including to Shopify, suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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=bootstrap+template+for+profile+page
    • http://files.silvaopus.com/uploads/1/3/1/3/131398174/woduti_buzibupenev_xowojulevaxedij_xazikare.pdf
    • http://files.dupageanimalfriends.org/uploads/1/3/1/4/131406391/7521643.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7483/7925/files/converter_em_autocad_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1326/files/32489432341.pdf
    • https://cdn.shopify.com/s/files/1/0438/9814/2875/files/suffixes_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0439/1046/3643/files/wodeluwi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4000/6559/files/80561282553.pdf
    • https://cdn.shopify.com/s/files/1/0440/0558/9157/files/sekiwojemoneruf.pdf
    • https://cdn.shopify.com/s/files/1/0447/1003/5609/files/lenov.pdf
    • https://cdn.shopify.com/s/files/1/0429/3669/6999/files/dilufasalebukejiru.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_off00006d3c.bin
69cf05d06457d4a3d32f87b7d99336a8f8bf8ff873095bff0c456c87e2f4faf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3C 5272 bytes
font_01_sfnt_off00007f19.bin
9c771068048f585547fdd6e85106b3404ee3fb59e56cf46bd5bcf69fbfcd3081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F19 10088 bytes

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