Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9bd97afab60fc8…

MALICIOUS

PDF

49.2 KB Authoring application: Solid Converter PDF
MD5: 3a14c452468c1603827eb8aa5740734f SHA-1: 9b02b9cf93569d81c011d5c7f86798a37ca24956 SHA-256: ba9bd97afab60fc84a674ba7912a13dd72311a69da8d5dbe3622a8f7c27fba60
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, and it exhibits characteristics of a link farm with numerous external PDF links. The document body, though heavily obfuscated, suggests a lure related to recommendation letters for university admissions. The primary attack pattern involves redirecting users to a large number of external PDF files hosted on various domains, likely for SEO poisoning or to serve further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://numbersbeathunger.org/uploads/1/3/0/5/130588487/7368783.pdf
    • http://lwfreferral.com/uploads/1/3/0/5/130542909/9ee8616df0.pdf
    • http://jenjacobsarchiving.com/uploads/1/3/0/4/130436078/40231.pdf
    • http://williamsonautomotive.ca/uploads/1/3/0/5/130551091/81c76f076c.pdf
    • http://nuecescanyonlodge.com/uploads/1/3/0/7/130775334/8889901.pdf
    • http://allworx9302.com/uploads/1/3/0/7/130740112/wixomanubowaregu.pdf
    • http://harbourhealthandwellness.com/uploads/1/3/0/6/130621462/b966d9.pdf
    • http://specialhairstyle.com/uploads/1/3/0/6/130639580/9201978.pdf
    • http://voteoliverjacob.ca/uploads/1/3/0/7/130776218/9696641.pdf
    • http://jermaineblackwell.com/uploads/1/3/0/2/130272406/349f29d971c3d1.pdf
    • http://mutethiajuniorschool.com/uploads/1/3/0/4/130488884/7665933.pdf
    • http://nickidenicki.com/uploads/1/3/0/4/130476423/nerebukixujedun.pdf
    • http://ledmadeeasy.info/uploads/1/3/0/7/130739353/5659271.pdf
    • http://ponometrics.com/uploads/1/3/0/6/130621601/gopiloku.pdf
    • http://26and2.club/uploads/1/3/0/6/130639571/vulugiwonitor.pdf
    • http://nurtureministries.com/uploads/1/3/0/8/130873810/vuwuti.pdf
    • http://paintandwinealbuquerque.com/uploads/1/3/0/3/130324170/6144882.pdf
    • http://www.fearlesssocial.net/uploads/1/3/0/5/130544043/130544043.html#sample+of+recommendation+letter+for+university+admission+uk

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000634a.bin
a31b2f010c08616e98578cc56d4b52b1e94ce98f6f2c3769aac97efb58d104e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x634A 8312 bytes

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