Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb39044f31b63cb…

MALICIOUS

PDF

39.5 KB Created: 2020-08-09 02:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1a6eb9b019967a075d49ec7a121391b6 SHA-1: f5bf8bc25a92a321a979771a0249c4d3142ec5b7 SHA-256: bcb39044f31b63cbcd835d94d96871f217ab65051139866ffdb56339f5e527e3
194 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links, many of which point to a redirector service. The primary malicious link identified is https://ttraff.ru/pify?keyword=brunelleschi+s+dome+ross+king+pdf, which is known to lead to malicious infrastructure. The document body contains a mix of text and URLs, suggesting a link farm or SEO poisoning tactic to lure users to malicious content.

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=brunelleschi+s+dome+ross+king+pdf In PDF document text
    • http://files.newspark901.org/uploads/1/3/2/8/132814958/2737278.pdfIn PDF document text
    • http://files.downeyrideandstride.com/uploads/1/3/2/6/132681698/wikiven-mutogozupuvilad.pdfIn PDF document text
    • http://files.buildingboxes.co.nz/uploads/1/3/1/4/131453990/9439840.pdfIn PDF document text
    • http://nodizim.samanthaforrest.com/uploads/1/3/1/4/131482976/somegobo-vifet-mivov-povatolotaxotoj.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/1/0431/6204/2532/files/guvogozopisun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6636/6869/files/whiskey_lullaby_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5524/2655/files/70061941996.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7620/6235/files/33951097663.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/beginning_yoga_poses.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9163/8934/files/zatevupuzidanabelawo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/79511776197.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4310/1591/files/46631119165.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/7422236992.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/kerosene_poisoning.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 4

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_off00005c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C66 5472 bytes
SHA-256: 51ebfeadbb7faf41ca6c6da3e662518783219b31622488d60b4fac3515c4d76c
font_01_sfnt_off00006ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE1 10024 bytes
SHA-256: 9db21509429607c8e4ef541af6c90346b09e73f24a425b6caafd2cb1992cea48

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