Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ce407e7b4b6d81…

MALICIOUS

PDF

103.2 KB Created: 2020-07-30 15:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 607e68467c1cd355ea7c9584b7852a94 SHA-1: ec9a2c58c1603fc0776eb435fb2a56fa6c3919b2 SHA-256: 66ce407e7b4b6d81d37e9e6174127a68267a27d5799bcc668c89cc5dd2786f35
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.cc) that is flagged as malicious. The document body, though heavily obfuscated, suggests a lure related to technical calculations, likely to trick users into downloading further malicious content. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=biological+wastewater+treatment+process+design+calculations+pdf In PDF document text
    • http://files.dermasheer.com/uploads/1/3/1/6/131637254/mokabonafoz.pdfIn PDF document text
    • http://files.jewellhjohnson.com/uploads/1/3/2/8/132816158/252b1d3f634b0.pdfIn PDF document text
    • http://files.humankindjournal.org/uploads/1/3/1/0/131070302/gixotil_zamovekeluwejaz.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/1/0427/4126/8647/files/fezusijoropiwamelimo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0200/2584/files/6920847556.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/67991586332.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2276/8535/files/79116359636.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3293/5574/files/vuwom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9468/6376/files/26126283510.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/64175868624.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6574/5312/files/41117289801.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/22068755685.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/kavafapifirulid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baxumedufimoval.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9390/7869/files/40915165954.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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_off00013e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E75 5500 bytes
SHA-256: e7b71c1fb81b58fc560d90b1f16639725af23431e05f84c4654ca1215e954992
font_01_sfnt_off00015116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15116 11432 bytes
SHA-256: 4a7063b6c706334a3df81631bd7ee34c70bf42514755e13443e4a6b80780e0db
font_02_sfnt_off0001781d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1781D 16232 bytes
SHA-256: 96db492adf3d082e1438ff72bc17c6d4f724b67599921063c5928f6f308df987

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