Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1a094ac8e8e579…

MALICIOUS

PDF

36.7 KB Created: 2020-05-13 09:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b31036232b867a7ee01e6e51f83d3ac6 SHA-1: 5c54de2624c3ae739fdd211c13c5c3b790f29c1c SHA-256: 8d1a094ac8e8e5796e00a8ddb5bd57cfe0b09ace4e5e4cca8e9d19063f9795bd
92 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 document body, though partially corrupted, includes the URL http://centregroove.com/uploads/1/3/0/7/130776069/130776069.html#how+is+diacetyl+formed+in+beer, which is also listed among the extracted URLs. This suggests a tactic to drive traffic to numerous external PDF files, potentially for SEO spam or to host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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
  • 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://centregroove.com/uploads/1/3/0/7/130776069/130776069.html#how+is+diacetyl+formed+in+beer
    • http://hardenbrowne.com/uploads/1/3/0/6/130639068/jerufofo-faxofebol.pdf
    • http://bighillcompanies.com/uploads/1/3/0/7/130740437/1751342.pdf
    • http://meridianintranet.com/uploads/1/3/0/5/130588251/tutawusabiz-lagux-vexodufek-tobosonodig.pdf
    • http://amipallets.com/uploads/1/3/0/4/130488357/5739d1.pdf
    • http://georgiaescaperooms.com/uploads/1/3/0/7/130739891/c1328963.pdf
    • http://free-addcallservice.com/uploads/1/3/0/3/130323672/a2bcb1ba.pdf
    • http://punkswithplaydoh.com/uploads/1/3/1/8/131856826/241814.pdf
    • http://genesis-schoolsofhope.com/uploads/1/3/0/6/130639544/zifaj.pdf
    • http://ericrossbeale.com/uploads/1/3/0/8/130814040/624721.pdf
    • http://miragetheatrecompany.org/uploads/1/3/1/0/131070678/457632.pdf
    • http://brickovendough.com/uploads/1/3/0/2/130272511/9620174.pdf
    • http://winderswise.com/uploads/1/3/0/5/130551839/zofaxobudapawotil.pdf
    • http://developingdifferencemakers.com/uploads/1/3/1/4/131406687/ragofavupu-xajon-taradulikaxoki.pdf
    • http://thissideofhope.com/uploads/1/3/0/6/130620887/wudulimoboked.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_off000063d8.bin
f90a79dc9efbeb91b685b519c60b2b9905f7077a378a2f21f16802a26f361df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D8 10488 bytes

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