Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff02730dafa7182…

MALICIOUS

PDF

41.7 KB Created: 2020-08-24 12:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bbce1756627d81fda6b55274b965340 SHA-1: 4d7984ea2aa169a28fdf61300e45f23b8363b767 SHA-256: cff02730dafa71829ed4acf451d1d528371fc47d9a78527a9834b658b3be564c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Mailing address format apartment' and the malicious URL, suggesting a lure. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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=mailing+address+format+apartment
    • http://puvod.brosnacanacademy.com/uploads/1/3/1/4/131405927/xufoxugeziri_mapufunolazoxuw_tawomoxilibe.pdf
    • http://faluwoni.rlighthouse.com/uploads/1/3/0/9/130969130/zoxikoxawak-tabake.pdf
    • http://vetizod.hermionemerry.com/uploads/1/3/0/9/130968973/nonewesofuj.pdf
    • http://files.arceasternpanhanlde.org/uploads/1/3/1/3/131384025/ee65b.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/beta_sheets_vs_alpha_helix.pdf
    • https://cdn.shopify.com/s/files/1/0434/5813/4182/files/jixemigaxenukinimumigedap.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/90804231193.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5230/files/36297184735.pdf
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/tevebexoburolumoma.pdf
    • https://cdn.shopify.com/s/files/1/0437/6811/9448/files/grievance_complaint_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0437/3407/3505/files/67301964203.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/66192504829.pdf
    • https://cdn.shopify.com/s/files/1/0439/7786/7422/files/11301826798.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/woxasexusugije.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/diablo_3_whimsydale.pdf
    • https://cdn.shopify.com/s/files/1/0435/1046/4667/files/bodimafevepikabigopoki.pdf
    • https://cdn.shopify.com/s/files/1/0436/9573/4937/files/futonuxaxaxogemoxuvugus.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_off00006539.bin
bf6faff4b90b3ae708ce346206c9539f678e03a570eea30033edf8883cd1f340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6539 5364 bytes
font_01_sfnt_off00007763.bin
3d5ea8feaf0af208bada822dd56a4967f6bf8427763935d291f72654387600d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7763 10144 bytes

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