Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87d80647986d09b…

MALICIOUS

PDF

45.5 KB Created: 2020-08-06 07:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f89ea81719fdd562c680c79f495154d2 SHA-1: fcfc33857f7d6604e4d7c8d75fd1383cf85db98f SHA-256: d87d80647986d09bcdb208878310744ad2a973b87b19cdc7703da860c4fbdec0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=administraci%25C3%25B3n+de+empresas+constructoras+2a+ed+pdf. The document body itself appears to be obfuscated or corrupted, but the presence of multiple Shopify-hosted PDF links suggests an attempt to manipulate search engine results or distribute content through a compromised platform. The ML classifier strongly supports the malicious verdict.

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=administraci%25C3%25B3n+de+empresas+constructoras+2a+ed+pdf
    • http://files.wonderful-morocco.com/uploads/1/3/0/7/130776673/dilameve_lixotu_tilosuz_vagemetofemede.pdf
    • http://files.alexbaecher.com/uploads/1/3/0/9/130969206/6285112.pdf
    • http://files.carrwriter.com/uploads/1/3/0/7/130776460/julenaritokedej.pdf
    • http://pujukus.provencemesservy.com/uploads/1/3/0/8/130813528/7891650.pdf
    • http://files.corneliahoogland.com/uploads/1/3/2/7/132740264/9741885.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/11746384072.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60527157158.pdf
    • https://cdn.shopify.com/s/files/1/0434/9162/3074/files/balanced_scorecard_advantages_and_disadvantages.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/rune_factory_frontier_bachelorettes.pdf
    • https://cdn.shopify.com/s/files/1/0438/4771/2928/files/51159676248.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/10110766477.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/jimagotubusaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/icy_veins_resto_druid.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7702/files/73162939535.pdf
    • https://cdn.shopify.com/s/files/1/0428/6113/3990/files/kunivukomefadizog.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/unix_commands_with_syntax_and_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/7773/8399/files/tonalekag.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_off00006e21.bin
01c0595f6cf3bf69595ba159a3164a132d7665566dfe48e19e9f845ab870e940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E21 5528 bytes
font_01_sfnt_off00008096.bin
e3873f5079d8c64aefcfb147878dfa9238c0c47b43012f138d21a3ae98e6cf89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8096 11388 bytes

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