Malicious PDF — malware analysis report

Static analysis result for SHA-256 051b6c1819861afb…

MALICIOUS

PDF

45.2 KB Created: 2020-08-04 13:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d6ac506f22fd5d639f74996b04cc13d SHA-1: 5888b4ec10b9a03810fd30e9eacea57e8c8e0861 SHA-256: 051b6c1819861afbbf2355dba8cfe7cc97e87eafa5f0c80b6910fb50ac87cfd4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=form+6b+affidavit+of+service+pdf'. The document body, though heavily obfuscated, contains references to legal documents and URLs, suggesting a social engineering pretext. The ML classifier also strongly indicated maliciousness.

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=form+6b+affidavit+of+service+pdf
    • http://files.myinfinitespiral.com/uploads/1/3/1/6/131606260/5514961.pdf
    • http://files.sandifie.com/uploads/1/3/1/4/131482866/ee8af9707ab.pdf
    • http://files.s3rd.com/uploads/1/3/1/4/131437941/menefovefosi-jokusetibuvila-sewujiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/bafifipupa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/zeworodulobogelitow.pdf
    • https://cdn.shopify.com/s/files/1/0435/9349/8787/files/roxema.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/tebera.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinubigelezegir.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/6261835028.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rirolor.pdf
    • https://cdn.shopify.com/s/files/1/0430/1520/9123/files/.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/64585289489.pdf
    • https://cdn.shopify.com/s/files/1/0436/7345/2697/files/xurukamapizoboxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5555796470.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006703.bin
8fe238d4efa118d1e805f072976fe3c461391de55fefcb4facfc8f71fb735506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6703 3016 bytes
font_01_sfnt_off000071be.bin
959343462ac69929658cd9c0b30b4113dca3b4bc82149e33d61c4ba2e4ca3d12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71BE 5576 bytes
font_02_sfnt_off000084a6.bin
e5b14f175fab10ecb3da14f0af2dcbcd1687efcc9f1689ebdcb17ff17abe4444		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A6 10264 bytes

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