Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdaa6318125e089…

MALICIOUS

PDF

32.3 KB Created: 2020-08-08 23:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a0ca092c4ef84a21d976703078dceb8f SHA-1: 21854673475e02df148f966370de3cacc5c9d935 SHA-256: 4bdaa6318125e08960446b94b54db02961a2553d5a63d18f37ada656f2b0ced3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link that points to `https://ttraff.ru/pify?keyword=compreender+o+behaviorismo+pdf+baixar`. This link is designed to lure users into downloading what appears to be a legitimate PDF, but instead leads to malicious infrastructure. The PDF also contains a mass external PDF link farm, with many links hosted on `cdn.shopify.com`, suggesting an attempt to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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=compreender+o+behaviorismo+pdf+baixar In PDF document text
    • http://vurul.laurel-lakes.net/uploads/1/3/0/7/130775607/9159589.pdfIn PDF document text
    • http://files.thebusybench.com/uploads/1/3/1/0/131069992/53f41b34a8cc2d.pdfIn PDF document text
    • http://files.4loveofbaskets.com/uploads/1/3/2/6/132681698/2119523.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/1/0431/6043/6896/files/8551963257.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5697/9351/files/boundary_value_analysis_in_software_testing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4899/2919/files/84219312083.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2524/4065/files/symmetric_vs_asymmetric_encryption.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5029/4678/files/zerazarikup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7814/7491/files/51092605024.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/25489486320.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/jeppesen_private_pilot_manual_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/daribobanelop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/webmail_apsk12_org.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9934/0448/files/17531712042.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 6

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_off00004206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4206 5424 bytes
SHA-256: 7dfb2b8112dbaef9729f18d008229ea9891025c090220117cd1e17b4ee6bd57c
font_01_sfnt_off00005444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5444 9324 bytes
SHA-256: db73d9e04b1394a09add494f06d31952f13a07b8d5b0a9d812616d0c86edb83a

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