Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98cf0fa9bea12a1…

MALICIOUS

PDF

36.7 KB Created: 2020-03-15 01:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e500ba4dc782d4dded563a8a4381a53c SHA-1: a653315ee05d7ba8b5f006c74b278d9ce79b903a SHA-256: a98cf0fa9bea12a1e3b899a0060d1684aa9f385e96979e171def043dfeb29889
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are dynamically generated and point to PDF files. The primary lure appears to be a link related to 'Pc full form in instagram', directing users to a potentially malicious URL. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms a pattern of link farming, suggesting an attempt to drive traffic to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://74-123-73-219.mgwnet.com/uploads/1/3/0/8/130873957/130873957.html#pc+full+form+in+instagram
    • http://plaid2pumps.com/uploads/1/3/0/6/130604287/gipemefizevudarek.pdf
    • http://hollywoodparktreeservice.com/uploads/1/3/0/5/130550712/lepijowot.pdf
    • http://cranecrews.com/uploads/1/3/0/7/130739715/mipokogemos.pdf
    • http://www.orlandodentistoffice.net/uploads/1/3/0/8/130873939/91b37cb0fb238ff.pdf
    • http://www.kobrathelabel.com/uploads/1/3/0/5/130539492/06cd6660.pdf
    • http://barrapayan.com/uploads/1/3/0/6/130639521/3726339.pdf
    • http://mta-sts.mail.kristenbarneich.com/uploads/1/3/0/8/130813401/segesurazubijil_jaleluwerobipu_bexutu.pdf
    • http://allentucker.org/uploads/1/3/0/6/130621373/7944915.pdf
    • http://www.getpoa.org/uploads/1/3/0/6/130604764/robozagetatojoj.pdf
    • http://marianayadrian.com/uploads/1/3/0/2/130272403/mowosevotorapegojig.pdf
    • http://www.americasbesthomeinspectors.com/uploads/1/3/0/6/130621225/5978768.pdf
    • http://alanktran.com/uploads/1/3/0/7/130776740/6746565.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_off00006699.bin
3ac64f944bb34b3371d6eb932715072b40dcd6f2815a1da7daa8eb475db67e7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6699 8236 bytes

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