Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c87d56b4be3fdaa…

MALICIOUS

PDF

41.9 KB Created: 2020-08-22 15:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7e1beeff5d0ff444d6f7bfb09e6664c SHA-1: b6aeaf00436332aa3e71ca3c60255010f3c2cfad SHA-256: 7c87d56b4be3fdaa3993de045056451a94769bfaa2e34c4f40c7b377825dd65e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link to a known malicious redirector, ttraff.ru, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the same URL and keywords related to diet PDFs, suggesting a lure to a phishing or malware distribution site. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for 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.ru/pify?keyword=spanish+ketogenic+mediterranean+diet+pdf
    • http://files.unknowngeniuses.com/uploads/1/3/2/6/132696604/4590500.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3765/5191/files/bf-_888s_frequencies.pdf
    • https://cdn.shopify.com/s/files/1/0433/5766/7487/files/17432410693.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3439/files/2766983693.pdf
    • https://cdn.shopify.com/s/files/1/0434/2077/8653/files/donuromabito.pdf
    • https://cdn.shopify.com/s/files/1/0433/6123/9192/files/depevuwevosu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9600/7065/files/bosch_ecosense_dishwasher_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/5019/5354/files/biological_weathering_of_rocks.pdf
    • https://cdn.shopify.com/s/files/1/0462/6766/2490/files/bbs_4th_year_result_2076_with_marksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/88733329200.pdf
    • https://cdn.shopify.com/s/files/1/0429/5232/7324/files/nutrisi_hidroponik.pdf
    • https://cdn.shopify.com/s/files/1/0437/6815/2216/files/65714733227.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064b8.bin
d6ff74118f53c9071bdadb142f0895347da3eb6021eaa9f00b58a9935af5792f
pdf-font-stream PDF embedded font (sfnt) at offset 0x64B8 5704 bytes
font_01_sfnt_off000077ea.bin
f1f43afeece63eee381c32f7b252489f250e0080c68ef4eccc6af9e2227ae3c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x77EA 10232 bytes