Malicious PDF — malware analysis report

Static analysis result for SHA-256 c447db0e01fed7ac…

MALICIOUS

PDF

48.2 KB Created: 2020-04-05 10:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 209ec6f33b0991d9d48d5cec83dd8007 SHA-1: ff978d33cdd7e74c868a4f9b1278175c225e3eb4 SHA-256: c447db0e01fed7ac22066dcc47906d9084a68c4e0dba35e7b4b1ce942a288567
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farms or to redirect users to malicious content. The document body, though partially corrupted, suggests a lure for a 'free book' to entice clicks on these links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://healthyfrying.org/uploads/1/3/0/2/130287914/130287914.html#libro+de+biotecnologia+alimentaria+gratis
    • http://hostmaster.pinkfloydprints.com/uploads/1/3/1/3/131383614/e1dcef.pdf
    • http://thesunkid.org/uploads/1/3/0/8/130813059/5c287135e173c0d.pdf
    • http://amyfungyilee.info/uploads/1/3/0/2/130291551/vazewe-totexujavan-kulenomuto-jisirasurek.pdf
    • http://elizalape.com/uploads/1/3/0/2/130272978/b41b9.pdf
    • http://sistemasappcc.com/uploads/1/3/1/4/131407042/vatudekeperefejez.pdf
    • http://givingtreevillage.com/uploads/1/3/1/4/131407763/napilu.pdf
    • http://hollywilliamsmusic.com/uploads/1/3/1/1/131164531/lekivijok-vojubaji-padonilikadeg.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_off00009419.bin
c850bf296600e1248a78b534245210912e8313ff35fd9981e0e1a88421456e73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9419 8404 bytes

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