Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91f67128e529225…

MALICIOUS

PDF

43.8 KB Created: 2020-08-07 05:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fc8bc02064c884130104b8d0a5d4d00f SHA-1: bbaade28c5e317215734b9769ed133435bde2225 SHA-256: a91f67128e529225240d43345f28d6d36e9049a7438fdcaa14e23197510d5e67
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link to 'ttraff.ru' disguised as a document about 'chemical effects of electric current'. It also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness.

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/pify?keyword=chemical+effects+of+electric+current+class+10+pdf In PDF document text
    • http://files.empkiesfarmmarket.com/uploads/1/3/1/1/131164112/3272498.pdfIn PDF document text
    • http://files.inthebeginningpreschool.org/uploads/1/3/1/3/131380094/bafejutasu.pdfIn PDF document text
    • http://files.fourseasonsbooks.com/uploads/1/3/0/7/130739169/1679beb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4163/5997/files/10079324146.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4324/8545/files/canasta_familiar_colombia_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/nilididiwodufebozedu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1180/9190/files/64493677347.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/tabebasirixanufedekafe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4115/1386/files/upper_limb_anatomy_lecture_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1034/2559/files/80986709661.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/vesobon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2866/7798/files/the_backup_plan_full_movie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4356/0346/files/first_law_of_thermodynamics_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/mikhail_bakhtin_carnivalesque.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 3

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_off00006d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D49 5492 bytes
SHA-256: 770d5923b2c61360f4e5103090617b925824e7b3eb581f237bc39bf70af10662
font_01_sfnt_off00007fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC7 9976 bytes
SHA-256: a6a8d630e3bf0d781ffa385a27f6c13fd0d36c69a8748c4312435cb12ea7665f

Open this report in the interactive analyzer, or submit your own file for analysis.