Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcd5b941a0cc3e8…

MALICIOUS

PDF

36.5 KB Created: 2020-08-20 01:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 80172d9113e3783986aab438af5ff586 SHA-1: 045d991a26f8312e768e882a5e5df82ad1a215ff SHA-256: 5dcd5b941a0cc3e866bfb12f9afa4fe3511f08fba3644afa874e2ea4a6904e67
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a redirector service (ttraff.ru) that is flagged as malicious. The document body, though partially corrupted, suggests a lure related to 'linking and action verbs exercises with answers' to entice users to click these links. The presence of many external links, including to Shopify domains, indicates a link farm or SEO manipulation tactic to distribute malicious content. No scripts were extracted, but the overall structure and link analysis strongly suggest a phishing or malware distribution attempt.

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=linking+and+action+verbs+exercises+with+answers In PDF document text
    • http://pufopab.tohscounseling.org/uploads/1/3/1/4/131407089/163646de11a.pdfIn PDF document text
    • http://files.simplywholesometreats.ca/uploads/1/3/0/9/130969889/kiwaxamufapuw.pdfIn PDF document text
    • http://silasola.chicagoguitarfestival.com/uploads/1/3/1/6/131636668/269d523283ce5f.pdfIn PDF document text
    • http://files.designmoulding.org/uploads/1/3/1/3/131380728/8711dd3.pdfIn PDF document text
    • http://navoz.bigislandeventrentals.com/uploads/1/3/0/9/130969352/3257511.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/1/0435/0859/6900/files/hit_notifier_mturk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3242/0264/files/introduction_to_automata_theory_languages_and_computation_4th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/7469/3794/files/bank_of_polampur_book_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/87002262456.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1990/1850/files/43358299829.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/4520/3618/files/infinite_geometric_sequence.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5933/9674/files/dojalodizavukowurikavi.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 4

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_off00005037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5037 5536 bytes
SHA-256: 4842280bd04c0b1ec6f5b6cd5a833422d3b8f5b47272ee8a44aa98743226e708
font_01_sfnt_off00006314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6314 9932 bytes
SHA-256: 1a5fa674922c6c16c2ccd03784fea60ad9c84c63e9aab61e4598e353afb1b48f

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