Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bf5ee7af8c956b…

MALICIOUS

PDF

44.7 KB Created: 2020-08-19 20:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca0f95d3356b02e03ba608ac7147eb45 SHA-1: 0760eb389ff3e8531021ba92769b0c513f87f967 SHA-256: 28bf5ee7af8c956b90b9e635ec963feafc38fc2c7486b0eea484bb84cc1f6cba
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=assetto+corsa+anderstorp, which likely serves as the initial point of compromise, redirecting to further malicious content. The presence of numerous other PDF links suggests a link farm or a broad distribution attempt.

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.cc/pify?keyword=assetto+corsa+anderstorp
    • http://bejixuzim.authorizedealers.com/uploads/1/3/2/7/132741144/5621019.pdf
    • http://tuzejumep.taylorbrothers.org/uploads/1/3/0/8/130873825/127f3c0470e2.pdf
    • http://files.ashuler.com/uploads/1/3/1/3/131381881/golovug.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/pabivilevopesototedopaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/0563/9836/files/67456345234.pdf
    • https://cdn.shopify.com/s/files/1/0428/7492/9308/files/90845104499.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nomevorijodasulalo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/kapesivema.pdf
    • https://cdn.shopify.com/s/files/1/0434/4584/6168/files/11916237226.pdf
    • https://cdn.shopify.com/s/files/1/0450/9827/0885/files/auditoria_financiera_gubernamental_peru.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/mugozenujefosubuga.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0036/files/additive_manufacturing_2020.pdf
    • https://cdn.shopify.com/s/files/1/0439/4660/6760/files/scream_and_shout_remix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000633d.bin
678a4069bdbb2767dc2f6bfa611a5caa8c0a43a98ad6ac6ccc8a04e0accfa8dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x633D 4764 bytes
font_01_sfnt_off00007367.bin
b496a3a438a1ea2624eb969635b72916d1318f9b70dddc39ed047e861f0298cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7367 11164 bytes
font_02_sfnt_off0000980d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x980D 4324 bytes