Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6f31adaaa439f1…

MALICIOUS

PDF

55.0 KB Created: 2020-09-22 07:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 03fba7195b43ae150802deab72b19e8f SHA-1: 56bb1fd184b16ed57e4087734ae849a0aae8c0e3 SHA-256: ca6f31adaaa439f1c137ded47414ab3d36a29d57f09f1c023ecdc5f05fe87f66
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URL 'https://ttraff.ru/wb?keyword=mass%20effect%203%20class%20guide' is a primary indicator of this malicious redirection. The document body contains garbled text but also includes the same URL, reinforcing its presence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wb?keyword=mass%20effect%203%20class%20guide In PDF document text
    • http://files.southernpreowned.com/uploads/1/3/1/4/131454034/jikox-vigojovu.pdfIn PDF document text
    • http://najemed.jbarneslab.com/uploads/1/3/0/8/130874161/ledumuro-wajogone-wegejeji-gototek.pdfIn PDF document text
    • http://rapuja.barbaraesanderson.com/uploads/1/3/1/0/131070705/metigonetuzafep.pdfIn PDF document text
    • http://vuxokeju.eastpauldingyouthfootball.com/uploads/1/3/0/8/130874575/6e8733e206103.pdfIn PDF document text
    • http://mevopibog.flylightyoga.com/uploads/1/3/1/4/131438562/suwigolewel_dovuv_surazixawe_liburufiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e9485d8-e501-4575-99f7-330903d1aac1.filesusr.com/ugd/5e5b2a_e3a91f1f091848a187154c8c9ec5f364.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/68731606950.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1186/4738/files/15861196803.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/stats_modeling_the_world_3rd_edition_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/zabulodikolirulo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/pioneer_deh-_3400ub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/4068/1633/files/so_big_so_small_lyrics.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000978d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x978D 5264 bytes
SHA-256: fc2e4202e96b3c266d77df01d0cc563bd09d0128ce8d085d23ea83cc1033863f
font_01_sfnt_off0000a993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA993 10972 bytes
SHA-256: 4754e5a8eb3e97222315514f5874c357d96075ba5e298ccefdf59f1988690cd3

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