Malicious PDF — malware analysis report

Static analysis result for SHA-256 66134fac3bb03381…

MALICIOUS

PDF

49.0 KB Created: 2020-08-03 09:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c16881713102e288fd377c90850e992d SHA-1: f2f14507309b3b736f4d91a0a10808cf6c9ab024 SHA-256: 66134fac3bb0338163c44930be772611291c0af520544d3eec6d0dd0dee25bac
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, with the primary URL being `https://ttraff.ru/pify?keyword=check+version+of+python`. This URL is presented in the document body as a pretext to check a Python version, likely to trick users into downloading a payload or visiting a phishing site. The ML classifier strongly supports the malicious nature of this PDF.

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=check+version+of+python In PDF document text
    • http://files.sotheycangohome.com/uploads/1/3/0/8/130874403/gukedinemoxepuj.pdfIn PDF document text
    • http://files.backstagenb.com/uploads/1/3/0/8/130814535/6225992.pdfIn PDF document text
    • http://files.mothermoonwellness.com/uploads/1/3/1/6/131636725/milekafixevi_kugefet.pdfIn PDF document text
    • http://welilan.vbptandwellness.com/uploads/1/3/2/8/132816066/86a6388f.pdfIn PDF document text
    • http://files.stcharlespilgrimages.com/uploads/1/3/1/4/131438500/0a599d3808.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/1/0435/2576/7320/files/62781330672.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rofan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/47313823226.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/49992715561.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/mivovupu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6571/2535/files/circle_of_life_elton_john_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/63134445676.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5093/4173/files/nagajexuroduwok.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 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_off00006f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F56 4992 bytes
SHA-256: 251fb5c71801a87ebf6c3fe7e65812d0e99ac72d7fc71730c591a98518b17de2
font_01_sfnt_off00008056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8056 3508 bytes
SHA-256: 0e52a5d9ea07c8b5fbf84441a08fc58c426174ba1b4714b803621cefe22ca0be
font_02_sfnt_off00008e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E24 12440 bytes
SHA-256: 485f963c6c7ce81ed7488b815af82ae03b4d268952d8bcd903cbd8816974ae2e

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