Malicious PDF — malware analysis report

Static analysis result for SHA-256 196cf1d5c77d0442…

MALICIOUS

PDF

47.9 KB Created: 2020-08-05 23:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3c6e33a293d872a46b2b4fd4fe4f023 SHA-1: 4b0e9369c8c3aaf5fbaf92d2d8de7a32c5c1a53f SHA-256: 196cf1d5c77d044256e32b01323d7b5bd54ef0bd179c0a3840219057e0ed181c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify, but one critical link redirects to a known malicious infrastructure at 'ttraff.cc'. The document body, though partially corrupted, contains text related to 'ovulation methods' and the tool 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect 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.cc/pify?keyword=ensinando+o+m%25C3%25A9todo+de+ovula%25C3%25A7%25C3%25A3o+billings+parte+2+pdf
    • http://files.agallisresidence.com/uploads/1/3/0/9/130969003/pipapidod.pdf
    • http://files.madpuzzler.com/uploads/1/3/1/4/131482819/zomip-wivuj.pdf
    • http://files.thefirstdraftofanythingisshit.com/uploads/1/3/0/7/130740130/vomedasofot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/2993/8855/files/kivogabiranop.pdf
    • https://cdn.shopify.com/s/files/1/0438/6809/4629/files/xikejikopuxon.pdf
    • https://cdn.shopify.com/s/files/1/0435/6279/5171/files/dodunovudof.pdf
    • https://cdn.shopify.com/s/files/1/0435/5286/6455/files/college_physics_9th_edition_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/56300314451.pdf
    • https://cdn.shopify.com/s/files/1/0431/4637/9426/files/ussr_anthem_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/gumenu.pdf
    • https://cdn.shopify.com/s/files/1/0439/3598/9915/files/laxovaduvokudamuvuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1133/files/check_cudnn_version.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/zobexenubugepebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/fogogotarevuwuxoraza.pdf
    • https://cdn.shopify.com/s/files/1/0434/1612/5590/files/pukere.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fc.bin
f131cd9d7d9bb7f8b30db7c7e3ed334fa04c6508436abfa4de6593912d00dc73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FC 6176 bytes
font_01_sfnt_off0000790d.bin
11a8d4cbddf209105b27988901f4fbb03a192a2fb6e5672724bd64637733a888		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790D 13828 bytes
font_02_sfnt_off0000a1ec.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1EC 4324 bytes

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