Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4ffff08552c8f3…

MALICIOUS

PDF

43.8 KB Created: 2020-10-10 23:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 81aefc54b26a459978d86a80465645dd SHA-1: b3ba4e387d7a02c389b8a25d08c8c76bfc1b08c1 SHA-256: 0f4ffff08552c8f35d56455b541ec5b042dc574824b22a2e49bab35757d25fc2
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a critical heuristic identifying it as a malicious redirector link farm. The ML classifier also flagged this PDF with high confidence. The document body contains text related to furniture and a tool name, but the primary malicious function appears to be the extensive list of links, likely for SEO manipulation or to redirect 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/pify?keyword=ashley+furniture+leather+sectional+recliner In PDF document text
    • http://files.hilburnacademypta.com/uploads/1/3/1/4/131406413/1807e9b76.pdfIn PDF document text
    • http://files.hometowncoffeeandtea.com/uploads/1/3/1/3/131381374/mevum_metozinubetef_nokor_rugejola.pdfIn PDF document text
    • http://files.kikinaart.com/uploads/1/3/0/7/130739678/8637975.pdfIn PDF document text
    • http://sigaj.origin-of-religion.com/uploads/1/3/0/9/130969336/2027843.pdfIn PDF document text
    • http://files.trimbleassociates.net/uploads/1/3/2/6/132696210/nuzebilujivubadet.pdfIn PDF document text
    • http://velopixib.ztpbc.com/uploads/1/3/1/8/131871456/zulemexeg-xusas-vezibidotovali-jiraduloxokuse.pdfIn PDF document text
    • http://files.smearlychildhood.org/uploads/1/3/2/6/132695363/wivasatij.pdfIn PDF document text
    • http://files.villadelphini.com/uploads/1/3/2/6/132682030/9e496953751b3d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b59a04-7990-44a2-ad7c-9d4183fdd3e0/28754873429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f63737-3327-46ad-b38e-5d7b4b3d283d/gilumifevijir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b5046f-87ec-43a9-a557-07b166c1ec60/gezelexopojamazut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c112ba9-e1df-4276-903a-b3232515b8df/7599548699.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/everitt_middle_school_mascot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0458/9620/4442/files/can_you_die_from_laughing_a_lot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/0004/5211/files/grand_theft_auto_advance_gba_rom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/navamobuwojotubi.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_off00006d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D35 5060 bytes
SHA-256: a0e49927117fdd51fed5561161db0b23b52fa965919269c4327eac80a81da1bc
font_01_sfnt_off00007e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5D 10536 bytes
SHA-256: 6bc11e49852b2ace0e34647e612cb68728772c318a2b9d5e5984079175c2bf33

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