Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a12ac79771b359…

MALICIOUS

PDF

32.4 KB Created: 2020-09-14 00:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6ffd83e0c23ad2071f08def15c912b2 SHA-1: 20456e795a736bd7fdc0e5e32c3324cbb29efd29 SHA-256: 17a12ac79771b3598ebac4b37674c0fe5dd273c78d5595a9f8646fb3c258a71b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with the primary one leading to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be a mix of metadata and obfuscated content, but the presence of numerous links to external PDF files suggests a link farm or phishing attempt. No scripts were extracted, but the embedded links are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.me/pify?keyword=seiki+se32hy10+manual
    • http://ranepub.rebeccaelbaum.com/uploads/1/3/1/4/131409474/lizexurisidetolusog.pdf
    • http://jubukexu.gracebecker.org/uploads/1/3/2/6/132683138/3248077.pdf
    • http://votigapig.ptcgconsulting.com/uploads/1/3/0/9/130969873/9478597.pdf
    • http://files.undisputedboxing.ca/uploads/1/3/0/7/130775845/c003d72.pdf
    • http://files.starquarryhanoverians.com/uploads/1/3/1/3/131380786/suguredav.pdf
    • http://menigaban.rev-pile.com/uploads/1/3/1/3/131380767/50dbb321e9.pdf
    • http://files.nationalinnov8tive.com/uploads/1/3/0/7/130739155/gamawafobamimew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0789d5_864ec77c54cf4fbf99244fc82edae40d.pdf
    • https://static.usrfiles.com/ugd/69b86f_478e7021709647dcbb9cc4e0cc6f2fd5.pdf
    • https://static.usrfiles.com/ugd/29c71c_29d3d50ee52f44c2b6028ce1f4ae8aec.pdf
    • https://static.usrfiles.com/ugd/c5d40f_820bc04206504f48bee845e0089ab998.pdf
    • https://static.usrfiles.com/ugd/cafc24_aef371534af246378a8f382d57ec2374.pdf
    • https://static.usrfiles.com/ugd/aec2ea_e7fcdd73155144b49576d0bd477a79c8.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000040ec.bin
adc84c16020f9fe23f19f35838e9d7ff13094b9abe733b2959f50cffd6ee95bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x40EC 5588 bytes
font_01_sfnt_off000053d3.bin
7388dc23c65cf0846f771074583c99b299581284f0c41c921721fe0633a52435
pdf-font-stream PDF embedded font (sfnt) at offset 0x53D3 9768 bytes