Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e32d43bf9a0bb7…

MALICIOUS

PDF

44.4 KB Created: 2020-04-04 06:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 93416e8d0c4ae65e5cc8702491436afb SHA-1: ae2f29ce6f62507b40c7a8df8850de15f6721625 SHA-256: 61e32d43bf9a0bb717f7a1c1f4e6c642cf0c7078e817c56db0bd5e6e1b25f9ee
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. One of the embedded links, 'http://blacktreelofts.com/uploads/1/3/1/4/131406069/131406069.html#fallout+4+artbook+pdf', is presented as a lure. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users to potentially harmful 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://blacktreelofts.com/uploads/1/3/1/4/131406069/131406069.html#fallout+4+artbook+pdf
    • http://trimblevancouver.com/uploads/1/3/0/4/130435631/mumimina.pdf
    • http://uvgelpolish.com/uploads/1/3/0/6/130620587/f8da90.pdf
    • http://ametkorca.com/uploads/1/3/1/0/131069899/3395026.pdf
    • http://atlasmedia.agency/uploads/1/3/0/7/130776661/lewab.pdf
    • http://atsonmenswear.com/uploads/1/3/0/8/130813639/3375250.pdf
    • http://g9minerals.com/uploads/1/3/0/5/130545827/933bf4573442.pdf
    • http://autodiscover.dimage.com.sg/uploads/1/3/0/9/130969079/dukov.pdf
    • http://ainwc.com/uploads/1/3/0/6/130621464/gupaxo.pdf
    • http://revsolpropertymanagement.com/uploads/1/3/0/5/130590140/8512874.pdf
    • http://geelifewellnessllp.com/uploads/1/3/0/5/130543168/dofejabagusapa.pdf
    • http://mydashbord.com/uploads/1/3/0/3/130323106/pedivutemulokig_wijunekif.pdf
    • http://faithful32x32.com/uploads/1/3/1/4/131407625/rokatezazepen.pdf
    • http://nicolas-rigaux-photographe.com/uploads/1/3/0/7/130739116/wuvotusixakeb_ruwilera.pdf
    • http://natethehousewhisperer.net/uploads/1/3/0/6/130621217/72506.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_off000082a1.bin
5fb62efc37fa4cd53536b03111248adb250edcefaeb891969cf4d3fd06fa6ba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A1 8584 bytes

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