Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea2e8e2a18048ff…

MALICIOUS

PDF

43.0 KB Created: 2020-08-10 06:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d04473e2a179b51d0d586a12c404c2fb SHA-1: 1bf833cdd7912f9a0e8487570f353e202fe29d50 SHA-256: 3ea2e8e2a18048ffd59d6b188adf95047965690e38d8e815f1334164c573fe63
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at https://ttraff.ru/pify. The document body, though partially corrupted, contains this URL and text related to 'losses chart pdf', suggesting a lure. The ML classifier strongly indicates maliciousness, and the presence of a link farm further supports a malicious intent to redirect users to harmful sites.

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=set+off+and+carry+forward+of+losses+chart+pdf
    • http://files.marionnaz.net/uploads/1/3/0/7/130739027/soxitabu-roxetoj-togajawede.pdf
    • http://files.klodtap.com/uploads/1/3/0/8/130814225/9469891.pdf
    • http://files.katherinekeanportfolio.com/uploads/1/3/1/3/131378868/sazive.pdf
    • http://zodemab.christianmeditationrookies.org/uploads/1/3/1/4/131453133/19610844eb50ac.pdf
    • https://cdn.shopify.com/s/files/1/0437/0228/8537/files/lujafel.pdf
    • https://cdn.shopify.com/s/files/1/0430/5820/0729/files/9248524428.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/majekebudud.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7224/files/zomepekiwo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2015/5037/files/99742180507.pdf
    • https://cdn.shopify.com/s/files/1/0432/7669/7760/files/psql_command_line.pdf
    • https://cdn.shopify.com/s/files/1/0440/0631/0046/files/58725282122.pdf
    • https://cdn.shopify.com/s/files/1/0439/1016/8744/files/xerirotibosisu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/online_translator_german_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/jixolatagiwufajufako.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/jeduvexuradegunigufas.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1149/files/xaselo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7080/7459/files/4366656925.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6492/files/cswip_3._1_welding_inspector_course_notes.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_off00006a6f.bin
5c890ebc3adae27b797260d820da572dbbff3b180edde911a4d4297ef28d997b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6F 5540 bytes
font_01_sfnt_off00007d57.bin
a1d6e08591de2990e16389391e73b09d6c74446599d17550b63da61ac43fe941		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D57 9728 bytes

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