Malicious PDF — malware analysis report

Static analysis result for SHA-256 383749a16c5187aa…

MALICIOUS

PDF

40.3 KB Created: 2020-08-17 15:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2737c78ae058b6d734a9f8a1a7fc8624 SHA-1: 4f84e1077fcab40d3915c0bf8de164587e8fa0a7 SHA-256: 383749a16c5187aa82fbf4d6309a3f9ba0443dead16c40c55060ab97962277da
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a redirector service (ttraff.cc) known to host malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to lure users to malicious sites. No scripts were extracted, but the primary attack vector appears to be the malicious redirection 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=ffxi+goldsmithing+guide+2018
    • http://files.crackpotpodcast.com/uploads/1/3/2/6/132683181/b313de196.pdf
    • http://vezuki.villas37.org/uploads/1/3/1/4/131438416/7716278.pdf
    • https://cdn.shopify.com/s/files/1/0428/6906/3836/files/73409954120.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/all_types_of_communication.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6229/files/felatus.pdf
    • https://cdn.shopify.com/s/files/1/0438/8972/1496/files/baby_hospital_bag_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0434/3988/2402/files/grande_ecole_movie_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/37393842485.pdf
    • https://cdn.shopify.com/s/files/1/0446/2706/7043/files/kids_pixs_4.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/tibavurowizuji.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/wordly_wise_3000_book_8_lesson_6_answer_key.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_off00005f7a.bin
b8516ce650c3681d11f753784530dd5fe1f0797ed1ef523b565261ac7aba65a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7A 5560 bytes
font_01_sfnt_off00007263.bin
08129874b97d1a2afca6c8a6ed996ee0dea0d133b6954bc992e4b511a0dda6aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7263 10016 bytes

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