Malicious PDF — malware analysis report

Static analysis result for SHA-256 875df832363bda6a…

MALICIOUS

PDF

42.7 KB Created: 2020-08-08 08:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4a0675e9165bfd09eb2e5b0ded2be253 SHA-1: 4024123f3f508bda574ddb5a528df008838c993b SHA-256: 875df832363bda6a61bc25087400f5bdf6745cd2373a87dc8bde0349e98c6cd7
194 Risk Score

Malware Insights

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

This PDF document contains numerous links, many of which point to a redirector service known to host malicious content. The document body and embedded links suggest a tactic of creating a link farm to lure users with promises of free PDF downloads, likely leading to phishing or malware. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious intent.

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=endometritis+aguda+y+cronica+pdf In PDF document text
    • http://files.innerrhythmsmusic.com/uploads/1/3/1/3/131381675/vafemabilor-fukevaf-manuve-lemakuk.pdfIn PDF document text
    • http://files.heartlandpools.com/uploads/1/3/2/7/132740580/bobutomozi_xupupiluk.pdfIn PDF document text
    • http://pefod.romeprivatetransfers.com/uploads/1/3/0/7/130775934/9184576.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/1/0431/7901/6349/files/rukubudutis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6312/9765/files/widanumasadoluxadufuronaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4715/6903/files/50411589642.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/search_engine_marketing_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/bursary_motivation_letter_sample.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/lawaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7045/5965/files/14986450294.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7716/3416/files/xiwomujovuvosuwaxowatavof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6523/6901/files/48230452355.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7792/6040/files/project_diva_pc_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5847/0816/files/biology_brooker_3rd_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9118/9157/files/pirusim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2013/9170/files/nvidia_driver_not_installing.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_off00006640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6640 5504 bytes
SHA-256: 6b2326851b7535d308c75f3c12731ec5de8446f99ff88639f06bf01aecc3b2d0
font_01_sfnt_off000078ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78EF 11364 bytes
SHA-256: ec131e589d96c5a828d94cbc1bd17aed618ece8ea208d6ffffc0fed601b019df

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