Malicious PDF — malware analysis report

Static analysis result for SHA-256 671b9f11b39130b9…

MALICIOUS

PDF

58.4 KB Created: 2020-08-09 17:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6dc1bf395a688c8f6a0ad48aac93ffd SHA-1: efff75e9c00cae90e4c3b16daba6aa19e19dee5a SHA-256: 671b9f11b39130b9a25da5b5a96b55bb94e21abcb87d001555a0d9864e96a4b8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one prominently displayed as a lure for a "Bayesian statistics presentation pdf". This link, https://ttraff.com/pify?keyword=bayesian+statistics+presentation+pdf, points to known malicious redirector infrastructure. The heuristic PDF_SEO_LINK_FARM indicates the presence of numerous other PDF links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence suggest a malicious intent 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.com/pify?keyword=bayesian+statistics+presentation+pdf
    • http://files.lose-weight--faster.com/uploads/1/3/2/6/132695576/megasurufaz.pdf
    • http://joximok.rakhmaloveandharmony.org/uploads/1/3/1/4/131437601/9942027.pdf
    • http://files.michaeltsarion.com/uploads/1/3/1/4/131455463/wifukuxo.pdf
    • http://nokegok.bucklesandbeads.com/uploads/1/3/0/8/130814328/5987729.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9508/1635/files/94077721537.pdf
    • https://cdn.shopify.com/s/files/1/0447/0764/3545/files/calculus_10th_edition_solution.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2692/files/dasefaze.pdf
    • http://jigofedab.bellaceramicastudio.square.site/uploads/1/3/1/4/131407558/mawuzufurodejafem.pdf
    • https://cdn.shopify.com/s/files/1/0431/1705/2053/files/beats_studio_3_wireless_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/6189/3534/files/81058319935.pdf
    • https://cdn.shopify.com/s/files/1/0431/0768/0405/files/18141070777.pdf
    • https://cdn.shopify.com/s/files/1/0440/8855/7718/files/new_god_flow_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/1187/4716/files/47241240960.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32600433864.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/dayz_tv_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/86298697364.pdf
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/kazaxapopigifuwu.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_off0000a3ed.bin
f82b24584bed3654ebf8d846668d98da73bfc6aaaff82ea9c5e628e5ab53d10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3ED 5268 bytes
font_01_sfnt_off0000b5f2.bin
82c07b28b8c27bd56f4d579aec0d8cff6038326ad0a05dc68a7da745587266ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F2 11208 bytes

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