Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba19444a1725739…

MALICIOUS

PDF

44.2 KB Created: 2020-08-07 13:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 73d9df5ab2f55bdf94e02a6979216be9 SHA-1: 12da2d46da1b3a4a8f1518fba74340e6f1a6ead6 SHA-256: 4ba19444a1725739c2adbc81b31f7b2373a782baa0cbba1f43716a24c8d57131
194 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the document links to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=exercicios+resolvidos+de+convers%25C3%25A3o+de+binario+para+decimal+pdf'. This suggests the document is designed to redirect users to malicious sites under the guise of providing educational materials.

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=exercicios+resolvidos+de+convers%25C3%25A3o+de+binario+para+decimal+pdf In PDF document text
    • http://files.shakesreview.com/uploads/1/3/1/8/131871745/4194581.pdfIn PDF document text
    • http://files.aldenstidom.info/uploads/1/3/2/7/132741109/2066738.pdfIn PDF document text
    • http://files.davidmichaeldesigns.com/uploads/1/3/2/6/132681164/roxusefobejavuju.pdfIn PDF document text
    • http://files.jointheteam.saintleoresidencelife.com/uploads/1/3/1/0/131069899/82a5c5aa.pdfIn PDF document text
    • http://files.carolagodmanirvine.com/uploads/1/3/1/6/131607093/c14e7565adf2.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/1/0432/0568/9504/files/24895937949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8937/1029/files/machiavelli_the_prince_mansfield.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/wapavuloresexalas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2215/3890/files/tinkers_construct_tools.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3871/7605/files/74822890950.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3384/5150/files/mine_sweeper_cheats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7717/9294/files/76459944684.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/52424897512.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5502/2234/files/94362697272.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
🗂 Part of campaign: faithlosgatos.org 4 samples

Related samples 8

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_off000060ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60EA 5844 bytes
SHA-256: 7a0e79e48b072da730bd01614cdeb5bb963205a6092098f0bc1e55c8cb09fb4a
font_01_sfnt_off0000742d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x742D 15268 bytes
SHA-256: bdd4f4d56a834dbd7a767d4812f415dd0602da8515f3401ab4e7afcce3848e2d

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