Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca754231da28f6ed…

MALICIOUS

PDF

32.6 KB Created: 2020-08-25 00:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fad412d7a8e361a03e0b50d76c502940 SHA-1: 15393fd9f34d082d7332033d4add8cd7192b9b1c SHA-256: ca754231da28f6ed3800828e692c723b9ccd620c79029138dc9d464a5c3dae42
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic indicates these links point to a known malicious redirector service, likely used to mask the true destination of the attack. The document body itself contains text related to 'd and d character sheet', which may be a lure to entice users to click the malicious links.

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=d+and+d+character+sheet+3.+5
    • http://xikot.nnrfa.co.uk/uploads/1/3/1/0/131070450/jopanib.pdf
    • http://gikaf.embracefoundationgallery.org/uploads/1/3/1/4/131453197/lukajujabel.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3199/files/cambridge_certificate_of_proficiency_in_english_5.pdf
    • https://cdn.shopify.com/s/files/1/0429/8879/8111/files/50474966376.pdf
    • https://cdn.shopify.com/s/files/1/0432/2040/2337/files/58878119322.pdf
    • https://cdn.shopify.com/s/files/1/0430/4915/6757/files/nofututed.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/bukaxukamebezabeku.pdf
    • https://cdn.shopify.com/s/files/1/0434/4384/7328/files/acc_aha_guidelines_critical_limb_ischemia.pdf
    • https://cdn.shopify.com/s/files/1/0430/1098/2041/files/tikurekugimizegupog.pdf
    • https://cdn.shopify.com/s/files/1/0432/0310/0836/files/64269983798.pdf
    • https://cdn.shopify.com/s/files/1/0437/5317/7237/files/46167387733.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/25668779603.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/81827365920.pdf
    • https://cdn.shopify.com/s/files/1/0440/7905/5000/files/sokedilakomitusukelagin.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_off00004324.bin
1d265feaadebc8a9e7cb25c28c32dfc1f2ce3747d77ff049d5795a641547faa5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4324 5312 bytes
font_01_sfnt_off0000552b.bin
595bb20474efd5a5cc225ae09d31874e6cdd5301c83f1a16f3c0f4155dc7595a
pdf-font-stream PDF embedded font (sfnt) at offset 0x552B 9600 bytes