Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99d46efd12afc6e…

MALICIOUS

PDF

42.8 KB Created: 2020-08-25 00:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0df2d44b25b31393af4483212da6dbff SHA-1: f2c7953b1240d98688d273fe9aa0ed8652b78db2 SHA-256: c99d46efd12afc6e7316c175d978f79eb8ddb0785073c0594bdecc1cce8dd1a3
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The document body, though heavily obfuscated, contains text related to 'narrative essay outline template' and the malicious URL, suggesting a social engineering lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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=narrative+essay+outline+template In PDF document text
    • http://files.welleyofficial.com/uploads/1/3/1/1/131164431/bakukewejatas_fekugizajenudom_puligisibizume.pdfIn PDF document text
    • http://files.blakesburgchurch.org/uploads/1/3/1/4/131407898/7bad87e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/axfood_rsredovisning_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vaxopegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/sifebodetuxifiro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6605/7116/files/hindi_item_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0726/2367/files/72688475790.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8860/8418/files/linear_equation_in_two_variables_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5005/5318/files/connected_components_workbench_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/denijepakewonepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5349/9046/files/zokevixuvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/suniduwosudorokimixurakoj.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 2

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D44 4976 bytes
SHA-256: dc3c5c7e3968fb8d1db6e0f6e0484e8e6e7c7bf7e375c63e0e9f2f3f4d7eca2c
font_01_sfnt_off00006e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E26 10048 bytes
SHA-256: 18c327ed8721935f875a85d5cf7ee948be100d694a0e4a8b7d530c7c641f1378
font_02_sfnt_off0000907a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x907A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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