Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0d516a7b2c567d…

MALICIOUS

PDF

43.9 KB Created: 2020-08-11 09:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd421a907c3c295a3bb53dcdeff3b65a SHA-1: e9f63aab64239ed8d52f2d2bc175782acb3857fd SHA-256: bd0d516a7b2c567d71be242eee76d76ab634139c873ced135b8dd4e141c176c6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=feet+to+meter+conversion+chart+pdf`. The document body, though malformed, also contains this URL, suggesting the primary intent is to redirect users to malicious sites. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=feet+to+meter+conversion+chart+pdf
    • http://files.nacho-consortium.org/uploads/1/3/1/3/131378993/1498145.pdf
    • http://files.objectivemarketing.co.uk/uploads/1/3/1/4/131438835/8cc033.pdf
    • http://merogegoj.mw-earrings.com/uploads/1/3/1/3/131379179/belogemizudoxa-mulebemepetizik-lorujap.pdf
    • http://wigilopi.storeofhopeministries.com/uploads/1/3/0/8/130874104/ruduvobikevupef.pdf
    • http://komomitu.parentingincontext.org/uploads/1/3/1/8/131856185/rilewisexudag-remeg-bemexudulekebog-viwojud.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/vivaldi_summer_piano.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/tunadelozeto.pdf
    • https://cdn.shopify.com/s/files/1/0431/6577/8080/files/abramelin_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/1496/2848/files/paviwirurabomafuwikige.pdf
    • https://cdn.shopify.com/s/files/1/0430/0242/9593/files/62615607961.pdf
    • https://cdn.shopify.com/s/files/1/0435/5050/7167/files/easy_piano_sheet_music_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9567/files/fivotajoduginapupedez.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1655/files/lixar.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/rilopowof.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/23916478176.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/2997/files/92286960154.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76588695657.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006af7.bin
dbc25545e74797dc3bcdaee4638a31d328257514428fa2c523ccebdb0de3e06f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF7 5380 bytes
font_01_sfnt_off00007d21.bin
eb7ff0bf53f83cb44e45be75211bd2002fc6667c0f11a353c49f2eb5b67ce33a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D21 11180 bytes

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