Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3f3f2bdd1a3c62…

MALICIOUS

PDF

37.2 KB Created: 2020-08-21 12:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaaa7f858a8b25e62da0a5c36db4ee3a SHA-1: e3838248dc9264111b2a585a325c074518f42b5e SHA-256: 9a3f3f2bdd1a3c620ebe8f344593203cf4ed27cb9139d5db39d4a7f2d1028aec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with many embedded URLs pointing to external PDF files. The primary malicious IOC is the redirector URL, which likely serves as a lure or initial access vector.

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.com/pify?keyword=asphalt+java+game+free
    • http://files.embodycarolina.com/uploads/1/3/1/0/131069978/9286673.pdf
    • https://cdn.shopify.com/s/files/1/0430/6845/7122/files/16561893172.pdf
    • https://cdn.shopify.com/s/files/1/0466/2545/6293/files/tubigobiludot.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9395/files/kawumokusowubisulefazupo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/international_atomic_energy_agency.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/dalokuzifezan.pdf
    • https://cdn.shopify.com/s/files/1/0449/5595/9464/files/surah_yasin_sharif.pdf
    • https://cdn.shopify.com/s/files/1/0451/3749/4169/files/69409286739.pdf
    • https://cdn.shopify.com/s/files/1/0434/6658/8325/files/underground_concrete_water_tank_design.pdf
    • https://cdn.shopify.com/s/files/1/0428/6464/0159/files/bonjour_tristesse_english.pdf
    • https://cdn.shopify.com/s/files/1/0435/3854/6840/files/44388284046.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052e8.bin
be26c986027e67e66df89c703e716cfe53c9e0340dbe9d97a0f155756d7fddfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52E8 5440 bytes
font_01_sfnt_off00006557.bin
6e86d4c133937b09ed6b15abe47a6c20146942d6e3d85d38dfd23d039683cee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6557 10344 bytes

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