Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98bfda2330879da…

MALICIOUS

PDF

39.9 KB Created: 2020-08-07 22:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ac9de37db1592cc82f7ebbe6e6ec9f8 SHA-1: 57b111505868fb426a36763401ac0b1a519170f6 SHA-256: b98bfda2330879dacfb31ae6af6e853981af4e337d4e35e96936047c4b8cde4e
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to external PDF files, a technique often used for SEO poisoning or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=evangelhos+ap%25C3%25B3crifos+pdf+download'. The document body, though partially corrupted, also contains this URL, suggesting the primary intent is to redirect users to download further malicious 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.cc/pify?keyword=evangelhos+ap%25C3%25B3crifos+pdf+download
    • http://nevolen.noxonroadpta.com/uploads/1/3/1/4/131453060/zetulidaxi.pdf
    • http://files.rentatent-sw.co.uk/uploads/1/3/1/4/131438464/9454813.pdf
    • http://sexilixox.cpleinternational.org/uploads/1/3/0/9/130968921/0467257.pdf
    • http://files.profwilliamsbiology.com/uploads/1/3/1/4/131407742/juderefemulubes_zamaxiwibu.pdf
    • http://files.becomebettertv.com/uploads/1/3/0/7/130775659/2959323.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0436/9534/1723/files/xafodomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5676577217.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0517/files/zibevamasuxorifufijopan.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/87892905676.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/29121673151.pdf
    • https://cdn.shopify.com/s/files/1/0434/5305/5128/files/31240201467.pdf
    • https://cdn.shopify.com/s/files/1/0435/8530/6782/files/37769924770.pdf
    • https://cdn.shopify.com/s/files/1/0428/9452/4579/files/43658910919.pdf
    • https://cdn.shopify.com/s/files/1/0429/5698/0377/files/63926444872.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_off00005a8b.bin
937ab4a70b7c5c7f336c687fd6cd77fd143beed5a5c8694dfbf7ba0cf9cd6476
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8B 5660 bytes
font_01_sfnt_off00006da1.bin
c95d970ca3b8cba01dfea38ccb33fb5b17c2367defe5ede56f8d5d2815bc011b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA1 10420 bytes