Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51326b3cdba7d33…

MALICIOUS

PDF

40.3 KB Created: 2020-08-22 15:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 87cc8d3cb4b5638cd1c082c5def65171 SHA-1: ca490a1201b7f7dadd6900af805d3722e882c148 SHA-256: d51326b3cdba7d336cd1a9dc2260bb4f0767eb5c9b31fb77b601c3533f80b1d8
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, suggests a lure related to educational worksheets, aiming to trick users into clicking the malicious link. The primary malicious URL identified is ttraff.ru, which likely serves as a gateway to further malicious content or phishing pages.

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=solving+factorable+quadratic+equations+worksheet+1+answers In PDF document text
    • http://files.itsbendybo.com/uploads/1/3/1/4/131453636/jezusigeva_lipukada_kodedafa.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/1/0431/8402/9854/files/56833841623.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7079/7462/files/todifuriroz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dekafarisajanitid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9887/3762/files/97170955544.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9883/2037/files/pofomebusobujupej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/88627442638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9306/4870/files/jcaho_blood_transfusion_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7209/4362/files/59040923798.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/jazuxamuwejowadivabire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6591/5045/files/13084619351.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7441/1926/files/72947157269.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5978/9472/files/34123635203.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1059/4728/files/dota_2_discord.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_off00005d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D15 5920 bytes
SHA-256: 0276881303908f0cb576d3af6d2dbf4a9c67246301b6d13b2081d65fb0437d1c
font_01_sfnt_off00007141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7141 10208 bytes
SHA-256: 851c4a8fbf00d211706d95c0d260ba208b954a71203eeda26533d6ec35d34e38

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