Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d9ccd2d384582a…

MALICIOUS

PDF

42.2 KB Created: 2020-06-25 19:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc7a0ad7d96fb4dc6fd4b697908c0ce3 SHA-1: 52fd670af6cb8d59dafe225af4a30079980c867f SHA-256: 70d9ccd2d384582a9d34ce26ba883258b4e4183b2e9d9d8930a094a5d3b0ba66
174 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, masquerading as a textbook answer key, that point to known malicious redirector infrastructure and other PDF files. The document's primary function appears to be acting as a link farm to distribute traffic to potentially malicious sites. While no scripts were explicitly extracted, the presence of numerous malicious links and the ML classifier's high confidence score indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.cc/wp3?keyword=discovering+mathematics+textbook+3a+answers#discovering+mathematics+textbook+3a+answers
    • http://cpcalendars.ardentcare.com/uploads/1/3/2/7/132740990/4de06ee59ff5da1.pdf
    • http://redsea-rentals.com/uploads/1/3/0/4/130488884/3725339.pdf
    • http://brownselectricalservices.com/uploads/1/3/0/2/130270837/462423.pdf
    • http://justiceandadvocacy.org/uploads/1/3/0/6/130621013/7545390.pdf
    • http://daprojects.net/uploads/1/3/0/5/130588543/9309a901aeb39b.pdf
    • http://mta-sts.mx.spokanechiefsboosterclub.org/uploads/1/3/0/6/130622038/3534633.pdf
    • http://xvitality.com/uploads/1/3/0/5/130539108/budom-zogarejixem.pdf
    • http://thelivingwisdom.com/uploads/1/3/2/7/132741433/retefobidagik.pdf
    • http://yogamybedandme.com/uploads/1/3/0/6/130604583/varuzuwumorumitepes.pdf
    • http://simplecity.us/uploads/1/3/0/5/130589374/gijasude_sepogiguvapopiz_nedelimesaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vemazoxubisi.files.wordpress.com/2020/06/84620870454.pdf
    • https://jezofisuwoma.files.wordpress.com/2020/06/faxekegizowibamajar.pdf
    • https://vigafekiwi.files.wordpress.com/2020/06/37267256099.pdf
    • https://womimoxik.files.wordpress.com/2020/06/litupiwafesarovazux.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_off00006275.bin
4e8b4ff2a479f3afef88429dd082881ab744e01243377d1cec36f415861b37cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6275 5556 bytes
font_01_sfnt_off0000753a.bin
05731dbe63c0e3e261a7ec83b78874ee69d565a82cfa9598e693c8bf34b4ec09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753A 11392 bytes

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