Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e6c8ae8aaa0fe2…

MALICIOUS

PDF

33.5 KB Created: 2020-04-24 15:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 117f0bec84184ab7c267ac8acce599d2 SHA-1: acfb454c1a7f24703a4e466812a71a9d6867e2c1 SHA-256: c7e6c8ae8aaa0fe208f180ad12e5e9b25ac8582c34bfc4cf014231b1773ee670
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are structured as SEO-optimized links pointing to other PDF files. The document body contains text related to software searches, suggesting a lure to drive traffic to these external sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://chuzhappy.com/uploads/1/3/1/3/131383553/131383553.html#bluestacks+4+windows+10+32+bit
    • http://www.ojbaa.com/uploads/1/3/0/6/130639958/d5ad30a122f5a07.pdf
    • http://thesoonernetwork.com/uploads/1/3/0/5/130551607/pafezevu.pdf
    • http://livingcheers.com/uploads/1/3/0/6/130620949/xefufalujoripad.pdf
    • http://hi-strung.com/uploads/1/3/0/5/130551692/tenovinak.pdf
    • http://natureslovewellness.com/uploads/1/3/0/6/130605253/84b7f8.pdf
    • http://hopetechnologies.net/uploads/1/3/1/4/131437087/df9e8.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005acb.bin
3a0b5855f965f77c136aedc673e484ae11a7b7f16ff6815997a133cc29c369c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ACB 8256 bytes

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