Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbf43a598dd0087…

MALICIOUS

PDF

42.7 KB Created: 2020-08-06 19:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3909f79b6e41836c97b61bd5dc52be34 SHA-1: f4396375e4b683ffb1eaa981bd24d72d78e5c926 SHA-256: 9bbf43a598dd008726b0f272c58caba1e088ae3ae7994982bcdbe5969c98bf3e
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=gatiso+asma+ocupacional+pdf'. The document also features a large number of links to external PDFs hosted on various domains, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness, supporting the presence of malicious redirector links.

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=gatiso+asma+ocupacional+pdf
    • http://files.cfolcconference.com/uploads/1/3/0/7/130776358/zadaxeviluma.pdf
    • http://files.cpanyc.info/uploads/1/3/0/9/130968949/4044893.pdf
    • http://volegobig.mirrorimagedanceteam.com/uploads/1/3/1/4/131453177/2113656.pdf
    • http://files.jeanlucvilmouth.com/uploads/1/3/2/8/132814589/xanegilora_pajexux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xopiforosolakalaxelavur.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8695/files/vonuvefapifepesabonopesa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/81436536082.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/anchoring_script_for_prize_distribution_ceremony_in_school.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/38181857893.pdf
    • https://cdn.shopify.com/s/files/1/0448/0407/9777/files/sprawlopolis_rules.pdf
    • https://cdn.shopify.com/s/files/1/0428/9242/7430/files/3834580768.pdf
    • https://cdn.shopify.com/s/files/1/0450/6845/1992/files/alcanos_alquenos_alquinos_ejercicios.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/81608047107.pdf
    • https://cdn.shopify.com/s/files/1/0431/6318/9405/files/xampp_mysql_default_password.pdf
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/zenagumenijofigu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9289/2053/files/22205805488.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/68735292625.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cf2.bin
abe198b7ec3950d230cb68dbbbbd85c61196107ecc87275e4c5f539b721948ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF2 5000 bytes
font_01_sfnt_off00006dde.bin
4ba2d42c8015dd4d7fe41eb630e85bd08d7135cb5822bc1144146b3f44fb26d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDE 9872 bytes
font_02_sfnt_off00008fb2.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB2 4324 bytes

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