Malicious PDF — malware analysis report

Static analysis result for SHA-256 7858b5ed3366d1af…

MALICIOUS

PDF

41.6 KB Created: 2020-08-06 03:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6f0049f1de54e8606d2b9d886b26768f SHA-1: cf3de1e24e498966f006ff65e0d1b26662a94666 SHA-256: 7858b5ed3366d1af089cccc63943cca673bd8bcb55ea9693fab22616926cbb48
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to a redirector service (ttraff.cc) disguised as a free download lure. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malware. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution scheme.

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=c+programming+book+pdf+free+download In PDF document text
    • http://files.wchqfm.com/uploads/1/3/1/4/131452950/duxoso.pdfIn PDF document text
    • http://kofefevet.thecenterpittsburg.org/uploads/1/3/1/6/131637814/mexaziwixon-samofuwet-texukuvogewox-zapekavoni.pdfIn PDF document text
    • http://files.akbeadsociety.org/uploads/1/3/2/6/132696104/kafiginujapokawez.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/1/0428/4016/2470/files/xawosafowevezuzugebezix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/pdf417_barcode_encoder.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/77187570934.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/any_autocad_drawing_to_converter_online_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/94022806401.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8626/3960/files/nenaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5598/8387/files/girugobafo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5529/0270/files/nuxumibev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1473/1429/files/70429811232.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/attendance_certificate_format_for_school_students.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 5

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_off0000654e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x654E 5384 bytes
SHA-256: 658b571e1b5e6c355dab82a51210ac93562a43dbb18dc203c77522a1f4a864cc
font_01_sfnt_off00007798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7798 10072 bytes
SHA-256: 5fd7231a3aad0ba938d4b536651372192de7496baaf455614932b4430ff6da24

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