Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c71b1fd03115a5…

MALICIOUS

PDF

31.3 KB Created: 2020-05-20 01:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37cda1ce54aca333d5c856e5b416ed10 SHA-1: 9dd8ff4ac6cdcbd0778868340179d344eec11a45 SHA-256: a7c71b1fd03115a51291923cffb446554e3ac6d82468701106c9c0d6129a23f5
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample, but the sheer volume of outbound links points to a likely attempt to manipulate search engine results or redirect users to harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://thebeadstop.com/uploads/1/3/0/9/130969965/130969965.html#verbose+meme+template
    • http://pammysatticworkshops.com/uploads/1/3/1/4/131454024/051da4.pdf
    • http://ehealthverloskundige.nl/uploads/1/3/0/4/130478004/21dc4bebd0f8.pdf
    • http://agtco.net/uploads/1/3/1/0/131070508/vemotasajaxiziv.pdf
    • http://breadswithbenefits.org/uploads/1/3/1/1/131164351/ziligovixamura.pdf
    • http://huntedhome.com/uploads/1/3/0/6/130620470/disogiwepabik.pdf
    • http://siennahoney.com/uploads/1/3/0/3/130313026/309222.pdf
    • http://aaoccseminary.com/uploads/1/3/1/4/131454932/xefina_gosus_nuzofe_wajovebofuvo.pdf
    • http://tenzamusic.com/uploads/1/3/0/8/130873962/8399074.pdf
    • http://cjsplaypen.com/uploads/1/3/0/5/130588902/e856168dd9b32a.pdf
    • http://scoutvids.com/uploads/1/3/0/5/130551651/mavirubadepame.pdf
    • http://connect-to-care-victoria.ca/uploads/1/3/1/4/131454770/vamapase_dudiwaregotanoz_zuvujigeramegaw.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_off00004ef9.bin
e64c6a9a4a24e77826c0f90c17aadff3d589a8f289d3bfc1cbab91362f3562e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EF9 10396 bytes

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