Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c52263289ac427…

MALICIOUS

PDF

42.5 KB Created: 2020-08-19 02:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59833d8a8d5f45582bbcd1e3a43912cd SHA-1: 5dfbe6ef186259e0c1b55894c9db637af2acc146 SHA-256: 88c52263289ac4272559a634c0c421b74b1e15ff1045305fe484cd1c5b7faaf1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external resources. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead users to harmful content. The document body itself is heavily obfuscated and contains a URL that appears to be part of a link farm designed for SEO manipulation, likely to disguise malicious activity.

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=barycentre+de+deux+points+exercices+corrig%25C3%25A9s+pdf
    • http://files.st-abbs-market.com/uploads/1/3/1/4/131483097/rujuv.pdf
    • http://lusuna.belleminks.com/uploads/1/3/0/7/130776043/f8db0.pdf
    • http://dakukox.gustafjackson.com/uploads/1/3/1/4/131482975/6c0a5798b8b0922.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7981/8661/files/tafuverokolorad.pdf
    • https://cdn.shopify.com/s/files/1/0437/1926/2363/files/james_s_walker_physics_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/9268/0605/files/berberina_lemma.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/subogegumalakemodukob.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/20064372653.pdf
    • https://cdn.shopify.com/s/files/1/0431/4729/6922/files/kupefigotuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/masezitukobujepaja.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/99383921385.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/what_does_adv._stand_for.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/93589336949.pdf
    • https://cdn.shopify.com/s/files/1/0439/4736/0414/files/apple_keyboard_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6731/files/brothers_grimm_short_stories.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/vupexukuvikubax.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006202.bin
f431939af833681db7abb1bbf751d4cfdf6ec118d7eb8f44d9f894f6c5fe8b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6202 5652 bytes
font_01_sfnt_off0000751e.bin
be137756b320555a44e81c8d011009c2f7d2ba30eaa9e1bbdb3864190a22e68f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x751E 11736 bytes

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