Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb470923acca8a0…

MALICIOUS

PDF

92.9 KB Created: 2020-08-07 07:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5c1554ea5fad67a3a333361665540e51 SHA-1: 8a8156df742bc682007e126c98f90e4aeab32369 SHA-256: 4bb470923acca8a00671eea640839411c19c577d192b8ff595093eac226872a2
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating a link farm pointing to external PDFs. One of the primary URLs, 'https://ttraff.ru/pify?keyword=gesti%25C3%25B3n+de+calidad+total+metodolog%25C3%25ADa+y+herramientas+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is a key component of the malicious functionality. The presence of many external links, including those hosted on Shopify, points towards an attempt to manipulate search engine results or distribute malicious content through a large network of linked documents.

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=gesti%25C3%25B3n+de+calidad+total+metodolog%25C3%25ADa+y+herramientas+pdf In PDF document text
    • http://files.mohicounseling.com/uploads/1/3/1/8/131871586/1131834.pdfIn PDF document text
    • http://jezuf.castillosclasses.com/uploads/1/3/0/8/130873995/22c910d25a.pdfIn PDF document text
    • http://files.ninjamagik.com/uploads/1/3/0/8/130874629/jatupisejumelovavog.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/1/0432/2246/6720/files/liwirarikasefawegonari.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2499/6773/files/53975436763.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1438/8892/files/fixajodawoduwevubomo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/57002655504.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/heat_transfer_conduction_convection_radiation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/wii_wad_files.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3628/5860/files/nugitexudijata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0866/3462/files/96891039948.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57790570823.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7384/0038/files/pubunurezepusisiwizopetem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1887/8114/files/jedi_outcast_walkthrough.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4700/0983/files/55687233958.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/3847880123.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001293c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293C 5892 bytes
SHA-256: 082fe2f13e9c6c64cb8cda30f7ce58893a99fdf81c05c0a761c14482ef3d7cd9
font_01_sfnt_off00013cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDF 11640 bytes
SHA-256: dbdccaf105721e4178912bc51d1e7e8159d76eee7e0b70e57d4ea77d4970579a