Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd97ecd7681f56d…

MALICIOUS

PDF

40.0 KB Created: 2020-08-17 04:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26d5ed9e49aa751203014ee29b1ac99e SHA-1: c7b659f7e5af3595eaa5a901fd71153694a57051 SHA-256: dcd97ecd7681f56d670cea4ae1fb256b30a679d3948ea53bf82d3790270de948
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

This PDF file contains a large number of embedded external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The primary link directs to a known malicious redirector, ttraff.cc, which is disguised as a search result for 'breast cancer articles 2019 pdf'. This suggests a phishing or scam attempt to lure users to malicious infrastructure. No scripts were extracted, and the document body is heavily obfuscated, but the link farm and redirector are strong indicators of malicious intent.

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=breast+cancer+articles+2019+pdf
    • http://sexez.petesenoffphotographics.com/uploads/1/3/1/6/131637136/8cc8dc6d.pdf
    • https://cdn.shopify.com/s/files/1/0429/5049/2316/files/90075974610.pdf
    • https://cdn.shopify.com/s/files/1/0430/0190/5315/files/mukimidev.pdf
    • https://cdn.shopify.com/s/files/1/0438/2860/9186/files/ototoxic_drugs_exposed.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/45795628645.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26450106566.pdf
    • https://cdn.shopify.com/s/files/1/0434/5970/7037/files/25101412510.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/27812831110.pdf
    • https://cdn.shopify.com/s/files/1/0435/3281/2439/files/lagabujunoxakuf.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2166/files/wumunud.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_off00005dcb.bin
c09716e75b9d3ccb587748c907cee52b9a7ce51646509291f6f380c7ae098d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCB 5680 bytes
font_01_sfnt_off00007126.bin
f56ddcf4af09e769e1e54b12ee7177a9e63d0d02156a6cff0e203981b1fa57c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7126 10084 bytes

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