Malicious PDF — malware analysis report

Static analysis result for SHA-256 2559f2f5df103ec1…

MALICIOUS

PDF

38.2 KB Created: 2020-05-15 05:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0819b0bc3c1e0a6954bf97b65e80bf31 SHA-1: a959b987eadcbfe00a5f1cb3bdd0dc2ce764d431 SHA-256: 2559f2f5df103ec1d49191d2cd845b6f867233f9c1d49c48e4d79d18b61c1312
94 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 numerically or generically named and hosted on unrelated domains, indicating a link farm or SEO spam tactic. The document body, though partially corrupted, suggests a lure related to 'Aha acls test answers 2016'. The primary heuristic 'PDF_SEO_LINK_FARM' strongly suggests this is a malicious attempt to drive traffic to potentially harmful sites. No scripts were extracted from this sample.

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://missgclass.com/uploads/1/3/1/3/131398498/131398498.html#aha+acls+test+answers+2016
    • http://intuitivetransformations.net/uploads/1/3/0/8/130814283/jujafepalu-fosivogonuzeko-suwimofugoki-gidusevajanut.pdf
    • http://glebecourt.org/uploads/1/3/0/4/130435738/d927c6cd2165b4.pdf
    • http://feeluenterprises.com/uploads/1/3/1/8/131856191/f9f15c693e9c1a6.pdf
    • http://bergtraumafoundation.org/uploads/1/3/1/0/131070192/7e3481d50c8.pdf
    • http://bluegalaxygamer.com/uploads/1/3/0/6/130620168/145910.pdf
    • http://francealarmes68.com/uploads/1/3/0/6/130604392/ede2c704051b102.pdf
    • http://seeingtheworldinadifferentlite.com/uploads/1/3/0/6/130605289/0bdad8.pdf
    • http://divinefamilyinterventions.org/uploads/1/3/1/3/131382673/9266802.pdf
    • http://uppercervicalpro.com/uploads/1/3/1/4/131483418/3704889.pdf
    • http://ajarchinger.net/uploads/1/3/0/8/130874272/pubarotumibe_tetamijit.pdf
    • http://quizmytween.com/uploads/1/3/0/7/130739206/1d272.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_off0000662d.bin
6e2bcf7dcf7ae19089b78664616a992f72bd930416e43f9499120878d13a453c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662D 11708 bytes

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