Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a675160eb3aec34…

MALICIOUS

PDF

33.5 KB Created: 2020-08-01 10:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79a7a000ebe510e5caccc4620115cf52 SHA-1: 660621e022196704177f67e26064a542aea0c26f SHA-256: 0a675160eb3aec346b01f62656e06615a6c99f0f019fcfc1c92d31311da6664e
174 Risk Score

Malware Insights

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

The PDF document contains a phone number lure (800-662-4797) and is associated with critical heuristics indicating it links to malicious redirector infrastructure and a large number of SEO-optimized PDF links. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves social engineering via a phone number and a link farm to potentially lead users to malicious content or phishing sites.

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.com/pify?keyword=800-+662-+4797
    • http://files.green-runners.com/uploads/1/3/0/7/130775866/kigujavinevawutoxox.pdf
    • http://files.midnightsjourney.org/uploads/1/3/1/4/131406140/f65009e8.pdf
    • http://files.mudandleaves.com/uploads/1/3/1/3/131379296/e79d1004b7d.pdf
    • http://files.suzannabates.net/uploads/1/3/0/9/130969390/xidoge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4151/3894/files/jibomijilebisuvej.pdf
    • https://cdn.shopify.com/s/files/1/0439/3687/4651/files/ralufubebuwiparataf.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7826/files/2099855398.pdf
    • https://cdn.shopify.com/s/files/1/0430/6187/0743/files/lulak.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/18709761947.pdf
    • https://cdn.shopify.com/s/files/1/0432/1342/2753/files/farafowuwezemegoku.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/3075533858.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gekubamunanapomokavonata.pdf
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/14954211139.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2125/files/78783951531.pdf
    • https://cdn.shopify.com/s/files/1/0437/6641/5514/files/99651213530.pdf
    • https://cdn.shopify.com/s/files/1/0435/6613/7507/files/5332752647.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_off0000461a.bin
219a16800899e21ad16a1c247b4860bc6d14b3fd3c5716eb7f71741ff26c6730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x461A 5044 bytes
font_01_sfnt_off0000576f.bin
fb554ded363c3aba834d691f4d0d8d6a5128a082196f32523adde3d4efef45f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x576F 10044 bytes

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