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) First seen: 2020-08-10
MD5: dc7a0ad7d96fb4dc6fd4b697908c0ce3 SHA-1: 52fd670af6cb8d59dafe225af4a30079980c867f SHA-256: 70d9ccd2d384582a9d34ce26ba883258b4e4183b2e9d9d8930a094a5d3b0ba66
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is classified as malicious due to its extensive use of SEO link farming techniques, embedding numerous links to potentially malicious or low-reputation websites. The document body, while appearing to be about educational materials, contains a primary malicious URL that redirects to a keyword-laden page, suggesting a phishing or SEO poisoning lure. The presence of multiple PDF links to disposable hosting further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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) or Microsoft license-boilerplate 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 In PDF document text
    • http://cpcalendars.ardentcare.com/uploads/1/3/2/7/132740990/4de06ee59ff5da1.pdfIn PDF document text
    • http://redsea-rentals.com/uploads/1/3/0/4/130488884/3725339.pdfIn PDF document text
    • http://brownselectricalservices.com/uploads/1/3/0/2/130270837/462423.pdfIn PDF document text
    • http://justiceandadvocacy.org/uploads/1/3/0/6/130621013/7545390.pdfIn PDF document text
    • http://daprojects.net/uploads/1/3/0/5/130588543/9309a901aeb39b.pdfIn PDF document text
    • http://mta-sts.mx.spokanechiefsboosterclub.org/uploads/1/3/0/6/130622038/3534633.pdfIn PDF document text
    • http://xvitality.com/uploads/1/3/0/5/130539108/budom-zogarejixem.pdfIn PDF document text
    • http://thelivingwisdom.com/uploads/1/3/2/7/132741433/retefobidagik.pdfIn PDF document text
    • http://yogamybedandme.com/uploads/1/3/0/6/130604583/varuzuwumorumitepes.pdfIn PDF document text
    • http://simplecity.us/uploads/1/3/0/5/130589374/gijasude_sepogiguvapopiz_nedelimesaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vemazoxubisi.files.wordpress.com/2020/06/84620870454.pdfIn PDF document text
    • https://jezofisuwoma.files.wordpress.com/2020/06/faxekegizowibamajar.pdfIn PDF document text
    • https://vigafekiwi.files.wordpress.com/2020/06/37267256099.pdfIn PDF document text
    • https://womimoxik.files.wordpress.com/2020/06/litupiwafesarovazux.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6275 5556 bytes
SHA-256: 4e8b4ff2a479f3afef88429dd082881ab744e01243377d1cec36f415861b37cb
font_01_sfnt_off0000753a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x753A 11392 bytes
SHA-256: 05731dbe63c0e3e261a7ec83b78874ee69d565a82cfa9598e693c8bf34b4ec09

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