Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4acd7dce8869b8…

MALICIOUS

PDF

43.5 KB Created: 2020-08-23 04:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7c82e65a8d1130e8f80ad68cee8fd97 SHA-1: 6b2b3e5f22cd7517db4324468430f87107fd08e4 SHA-256: dc4acd7dce8869b8ceac9d97a1d67a80318d614d6f73dfb12eca2de81278769a
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector service (ttraff.ru), and another heuristic noted a large link farm, suggesting a phishing or scam campaign. The document body, though heavily obfuscated, contains references to the redirector URL and multiple shopify URLs, further supporting the link-based attack pattern.

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.ru/pify?keyword=jeopardy+categories+template
    • http://fexolu.douglasback2schoolblitz.com/uploads/1/3/1/4/131409310/pinolagesoka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23929268289.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/bewizobagavezuvovatesig.pdf
    • https://cdn.shopify.com/s/files/1/0441/2683/0744/files/25629139440.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/18967776733.pdf
    • https://cdn.shopify.com/s/files/1/0432/8456/2084/files/piwisa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6015/8873/files/15564639476.pdf
    • https://cdn.shopify.com/s/files/1/0428/4973/0727/files/wajanidegasadadimepel.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/sokapujido.pdf
    • https://cdn.shopify.com/s/files/1/0441/4413/2248/files/kudalosusakow.pdf
    • https://cdn.shopify.com/s/files/1/0431/7741/0720/files/nudimerudoxusozededamosa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5782/3396/files/32904120388.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_off00006b51.bin
f540caf70f4b0c4ef203298b58fac70f9cbf4e58e9e400e342abcb37731720c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B51 5484 bytes
font_01_sfnt_off00007de8.bin
578554d292ee987ea4f1ec80f5f8306ee5cfbf401031643bf5ea942f92c154e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE8 10488 bytes