Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f0ba5c857f975a…

MALICIOUS

PDF

40.5 KB Created: 2020-08-04 21:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81ceb3e299987ddc978e6631026fc61d SHA-1: c15fe95b852b1a73a47e1e83cb0d63090cb7b954 SHA-256: 14f0ba5c857f975a9495901fcf66159aba074fbc41c353150f0da28611391e65
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The primary malicious link, https://ttraff.ru/pify?keyword=pathophysiology+of+heart+disease+book+pdf, suggests a lure related to academic content to entice users to click. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms the intent to lead users to harmful content.

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.ru/pify?keyword=pathophysiology+of+heart+disease+book+pdf
    • http://files.quetecuente.com/uploads/1/3/0/7/130775634/3168414.pdf
    • http://files.365downandout.com/uploads/1/3/0/9/130969710/rezegexavegepa-wufevelax.pdf
    • http://files.foundationschristianschool.com/uploads/1/3/1/8/131871705/2d6923f375f09a.pdf
    • http://gejuduwug.michelleconsidine.com/uploads/1/3/1/6/131606186/jefubusofise.pdf
    • http://files.radpanovphotography.com/uploads/1/3/0/9/130969472/6500398.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jobevemavesofidubuxiwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/zifapatuvas.pdf
    • https://cdn.shopify.com/s/files/1/0432/3485/3021/files/36372132704.pdf
    • https://cdn.shopify.com/s/files/1/0430/0052/9049/files/29732498555.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/9913969009.pdf
    • https://cdn.shopify.com/s/files/1/0429/1674/1286/files/pupunovurisud.pdf
    • https://cdn.shopify.com/s/files/1/0437/7542/6721/files/zesekibibowivupopidopi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/tuxoxuvejavabadowumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0225/6795/files/lubotufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/wekuxufanigupes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/widuko.pdf
    • https://cdn.shopify.com/s/files/1/0437/4842/5889/files/magalurod.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4843/files/paladin_5e_oathbreaker.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_off00005f73.bin
2d163124bb718987450b71e76fe481fd792e68b489f4f48f8b46592554a261c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F73 5612 bytes
font_01_sfnt_off00007285.bin
159988a430fbff88d6afa9cbcf1b9a4f4c7d95c6a2088386cde488e3852f6533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7285 10116 bytes

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