Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99e4e876cba07ec…

MALICIOUS

PDF

46.2 KB Created: 2020-08-22 19:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4d4c1dde06d4bfdf5833149cb6e62880 SHA-1: 87be6cfa7cb005dac48aa3ea3b56091d8f17cb7c SHA-256: b99e4e876cba07ec985eb6bd81e6beb63874e02e68a8f72f0bd1c5a13eeeb215
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=one+diffusion+and+osmosis+lab+answers', which is likely intended to redirect the user to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to drive traffic to the malicious redirector.

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=one+diffusion+and+osmosis+lab+answers In PDF document text
    • http://files.albertahealingarts.com/uploads/1/3/0/7/130775462/fezewenudepa.pdfIn PDF document text
    • http://files.thewelltraveledteacher.com/uploads/1/3/0/9/130969368/bulaja.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/1/0434/7772/9430/files/49421884078.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9967/5040/files/bowenesojetaxafut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0537/6669/files/75933381752.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7798/3653/files/xavedepenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9087/7339/files/53148553181.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5542/3383/files/46922572383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2017/3983/files/all_animals_names_with_pictures.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6195/3191/files/popizesipibefeziripepu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8121/8710/files/36302875863.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4040/7701/files/34927681159.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1732/3175/files/75366327129.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6477/1238/files/2756937062.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9025/4749/files/la_times_crossword_clues_answers.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 6

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_off0000761c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x761C 5312 bytes
SHA-256: 677e56f31028cd57e2f31e89c82064e5ad7fac23246000d0202d4a150a15a341
font_01_sfnt_off00008820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8820 10404 bytes
SHA-256: 517421dd8a290ce8344e51cfa9c726bc631b8aeb3aae41a74140b13c45eda303

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