Malicious PDF — malware analysis report

Static analysis result for SHA-256 7731fa0308d83884…

MALICIOUS

PDF

33.6 KB Created: 2020-04-18 23:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d19f72538be7d1e9a48ec0bd9c24af76 SHA-1: 7cbe8a29decc2045f5225535e72ce081c2745334 SHA-256: 7731fa0308d8388491020ed56a4f0348363f4677ed2bd6ac4e884e56b090ff8f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. These links point to various domains, many of which appear to be part of a link farm designed to manipulate search engine rankings or host malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves leveraging these links to redirect users to potentially 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://information-packet.com/uploads/1/3/0/7/130740356/130740356.html#healthy+food+guide+australia+instagram
    • http://octanegarageandperformance.com/uploads/1/3/1/4/131438667/4704f24f2f08b.pdf
    • http://philambdadelta.com/uploads/1/3/0/7/130775318/1678467.pdf
    • http://lizziebrenkusfit.com/uploads/1/3/0/4/130489070/fokudogukawowus-zibeb-rusagerunegovo.pdf
    • http://postacrush.com/uploads/1/3/0/6/130604636/meziwumolufa.pdf
    • http://odmelectric.com/uploads/1/3/1/4/131455158/9854728.pdf
    • http://thegraylab.org/uploads/1/3/0/5/130590478/4bdb1e1.pdf
    • http://crispandsmooth.com/uploads/1/3/0/6/130621798/1701358.pdf
    • http://asabbathinnicaragua.com/uploads/1/3/1/4/131407890/wejizak-rekidog-zafegab-xuzumenegife.pdf
    • http://peternicieja.com/uploads/1/3/1/4/131483110/3499728.pdf
    • http://greatracegbg.com/uploads/1/3/0/9/130969647/2329805.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_off00005c89.bin
bc0b1d56d894c08968d8068b2d719e096810a51499f0cecf4a7d7c2a00f0ee7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C89 7768 bytes

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