Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99d7c1ef66cce7e…

MALICIOUS

PDF

43.7 KB Created: 2020-08-09 12:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5cbcf2c0026627a958f0d91c4fe168ea SHA-1: 667a12df91128e08d01b1c0c437e844c9e3e4031 SHA-256: d99d7c1ef66cce7e7d30b0e871f99fcc00703f7c49b7d1a25d6397ec35dd9344
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used in link farms to artificially boost search engine rankings or to distribute malicious content. One of the primary links, 'https://ttraff.com/pify?keyword=gest%25C3%25A3o+do+risco+de+cr%25C3%25A9dito+pdf', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it is a key component of the attack. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, further supports the link farm hypothesis.

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.com/pify?keyword=gest%25C3%25A3o+do+risco+de+cr%25C3%25A9dito+pdf In PDF document text
    • http://files.eatavo.com/uploads/1/3/0/8/130813516/bovijeputaluge.pdfIn PDF document text
    • http://files.visittbo.com/uploads/1/3/2/3/132303013/nidiwor.pdfIn PDF document text
    • http://zutunejaw.tanithfrost.com/uploads/1/3/0/8/130873851/rogosorumetez-vetidaxa-rowoxefefo.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/1/0434/2287/5813/files/32245261793.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/7323/6131/files/reading_comprehension_5th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2883/2675/files/bumunotamivovajizovokut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4744/3865/files/vajisowelu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/tonizijalasamav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9646/5823/files/marketing_strategy_for_automobile_industry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/xefamoras.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/xosarukinaxinu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6073/9752/files/76737506725.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6894/7616/files/jowajifizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/84802010379.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_off00006928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6928 5400 bytes
SHA-256: f7f3dc79e3ece76668366156e95e5273e2fab833abe94973954dab9f65b5906f
font_01_sfnt_off00007b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4F 12236 bytes
SHA-256: 6d40340ed0490c6e9e4ab3d538f6be79d22350616d6559cfad06da435e14ba01

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