Malicious PDF — malware analysis report

Static analysis result for SHA-256 98587fa944c7f809…

MALICIOUS

PDF

40.2 KB Created: 2020-04-24 01:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f1c916423dbb7016453a55c5e181c02c SHA-1: 3bdb7b25c9c212f27d775460e67e221f1421e1dd SHA-256: 98587fa944c7f809fa82572d8dbc2550e973079e41d6e55e85ab676cbc8ac1a6
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL, http://deafactioncenter.net/uploads/1/3/0/2/130288567/130288567.html#harrower+gloomhaven+guide, appears to be part of this link farm. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted from this sample.

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://deafactioncenter.net/uploads/1/3/0/2/130288567/130288567.html#harrower+gloomhaven+guide
    • http://revitrenderings.com/uploads/1/3/0/5/130543035/0912e488e77c.pdf
    • http://centuryglassdfw.com/uploads/1/3/0/6/130605384/2903335.pdf
    • http://northwestfineartstudio.com/uploads/1/3/0/6/130640009/gitepabinuzere.pdf
    • http://destinationenvp.com/uploads/1/3/0/3/130323236/lobilabilar.pdf
    • http://chazahvideo.com/uploads/1/3/0/2/130291531/jumukir.pdf
    • http://bicdiamonds.com/uploads/1/3/0/4/130436122/fagodobumefe.pdf
    • http://food-ingredients.net/uploads/1/3/0/7/130775728/zoxas.pdf
    • http://trophymarine.com/uploads/1/3/1/4/131452860/7028710.pdf
    • http://indysponsors.com/uploads/1/3/0/6/130621083/9519706.pdf
    • http://bch-marketing.com/uploads/1/3/1/4/131454027/katomob.pdf
    • http://portlandactual.com/uploads/1/3/0/7/130776487/voxudesadofe.pdf
    • http://creditschooltuescueladecredito.com/uploads/1/3/0/7/130740623/9979015.pdf
    • http://neighbornotary.com/uploads/1/3/0/5/130542718/rimin-gusojabolutakab.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_off00007639.bin
00c6e32a1f77bcab7b211c33c9a219802161cd4922053f0bae6ce0598f2e9bb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7639 7448 bytes

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