Malicious PDF — malware analysis report

Static analysis result for SHA-256 6424bd2f96eb3937…

MALICIOUS

PDF

44.7 KB Created: 2020-07-29 23:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 752457501b3422c6261fdaa6bcc14a2a SHA-1: c8e870506cbfa55803dd1f0d211ac3eabce2d64d SHA-256: 6424bd2f96eb3937cab62aeb60e3529c3d1a6289a1408502d417bbeeaa2a08a6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a link to a book. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to redirect users to potentially harmful content.

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.com/pify?keyword=clinical+anatomy+made+ridiculously+simple+4th+edition+pdf
    • http://files.laws.cassadaganewyork.org/uploads/1/3/1/3/131379325/3b7a3350d56742b.pdf
    • http://files.ouranosmarkettiming.com/uploads/1/3/1/4/131408954/ab02c8a8c162622.pdf
    • http://files.novapublishers.net/uploads/1/3/1/8/131857117/13033d9a.pdf
    • http://files.remodelcostspreadsheet.com/uploads/1/3/1/6/131606453/zobonifarevufa_fafelidenamo_tikoto_kodaperevi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4059/5355/files/70494854703.pdf
    • https://cdn.shopify.com/s/files/1/0437/2699/5621/files/46248539743.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2404/files/86326686931.pdf
    • https://cdn.shopify.com/s/files/1/0432/3688/4642/files/28105279273.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/gowivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52733892229.pdf
    • https://cdn.shopify.com/s/files/1/0437/1218/4474/files/roponuwobujoruzupijera.pdf
    • https://cdn.shopify.com/s/files/1/0431/5598/0439/files/fidokanuvotivimefenaviwod.pdf
    • https://cdn.shopify.com/s/files/1/0428/6778/5884/files/wafepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/batavitujub.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/27898501670.pdf
    • https://cdn.shopify.com/s/files/1/0435/4709/9287/files/73176512931.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006456.bin
5fdbdb692602882f56b2f860a4b53ea236923fa1c113a72ac8290731ff35fe4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6456 5488 bytes
font_01_sfnt_off000076ce.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76CE 1800 bytes
font_02_sfnt_off00007f5b.bin
30cc3544c1a09f9693ae5ee0e5d5476b20daabe8db82f3f49d054ccf1e6e5778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5B 10400 bytes

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