Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d927a9aa087ad9…

MALICIOUS

PDF

40.9 KB Created: 2020-04-22 09:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d3a67b8dd8a9805a4cf1b0f9f1151faf SHA-1: 200e197199e6a2905c3782067776e4fafd32bd58 SHA-256: 57d927a9aa087ad944ca83979eda29e0c3f9874512b1baf0f9cc5f4869d193fb
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, many with numeric or generic slugs, indicating a link farm or SEO poisoning tactic. The document body mentions 'Lg g5 se aggiornamento android 8', suggesting a lure for users seeking Android updates. The PDF_SEO_LINK_FARM heuristic firing confirms the mass external linking. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://naturalfitnessvt.com/uploads/1/3/0/5/130588506/130588506.html#lg+g5+se+aggiornamento+android+8
    • http://mindhealthconnection.org/uploads/1/3/1/6/131606550/valok-jefirixiwej.pdf
    • http://flurning.com/uploads/1/3/1/3/131378972/6471257.pdf
    • http://natural-organix.com/uploads/1/3/1/6/131607005/d3a64a74b263.pdf
    • http://vera88keys.com/uploads/1/3/1/4/131410736/jozuxejutugit_mutov_ramenaxosi.pdf
    • http://toyconsignmentsale.com/uploads/1/3/1/3/131380299/sopobufijotos_tutaterugibalo_fekumix.pdf
    • http://chelleyseibert.com/uploads/1/3/1/4/131483465/9341984.pdf
    • http://mindhealthco
    • 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_off00006c4c.bin
2eb3241b26d35f940a3991b32b767571ffa45f3781ec8316ad4d4492778ac46c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4C 9192 bytes
font_01_sfnt_off00008e54.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E54 2616 bytes

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