Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e71dff3a08e0e73…

MALICIOUS

PDF

42.3 KB Created: 2020-08-14 01:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c3de84bbfd416ee0ef9076c0b9765f96 SHA-1: 4260bc91b5e0314f7189a954c8bb73136dd31dbc SHA-256: 7e71dff3a08e0e73770c1151a6527e2f43428594c78469968811c0d74ef34587
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document body contains text that appears to be a lure for an invitation letter, and it embeds numerous links, many of which point to SEO-optimized PDF files. The primary malicious URL identified is https://ttraff.cc/wb?keyword=sample%20invitation%20letter%20for%20guest%20lecture%20in%20college%20pdf, which is likely used to redirect 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.cc/wb?keyword=sample%20invitation%20letter%20for%20guest%20lecture%20in%20college%20pdf In PDF document text
    • http://roliped.sexoffendercontainment.com/uploads/1/3/2/7/132712593/1895854.pdfIn PDF document text
    • http://files.aksushiya.com/uploads/1/3/0/7/130776673/gevomalujema_pojolutexu_nofarenawe_mutoze.pdfIn PDF document text
    • http://files.phantomfilmschool.com/uploads/1/3/0/9/130970003/daguxi_duviz_tivigaz.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/1/0439/9503/7854/files/vemosudibakijowajijage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2228/4960/files/spectrum_tv_guide_myrtle_beach.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9243/4326/files/novez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/1569184464.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/37821642767.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8260/2913/files/flight_of_the_bumblebee_sheet_music_violin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/kalirutufamisavanival.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3704/7449/files/37282402656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0523/8692/files/75714160295.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/86967698862.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 3

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_off00005c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6E 5636 bytes
SHA-256: 54ec1fb17a895962887e028e72b0f21163b144853964b94599bdecae4ce45d21
font_01_sfnt_off00006f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F86 13548 bytes
SHA-256: ee859e4eae189ee23e8e098eb72532cb20906670e8124ea32012832b3a175570

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