Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c61bf34c31430d…

MALICIOUS

PDF

37.6 KB Created: 2020-09-04 11:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2ea8db638ccbd191c869ed0fc6c148c SHA-1: 7d89bc4d1d23e3fc5459b2340d076b244cb47a9a SHA-256: 85c61bf34c31430de5df33b0531d2b92e8ce7b1ccd01e89e255a5edba8718e1c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wix?keyword=frontline+commando+cheat+game', is designed to lure users with a deceptive keyword. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious distribution scheme.

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/wix?keyword=frontline+commando+cheat+game
    • https://cdn.shopify.com/s/files/1/0430/7052/1495/files/10632283272.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/fusimuzusujegofilig.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/66364801493.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/35133010433.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/wagaked.pdf
    • https://static.usrfiles.com/ugd/e4ee87_5993301ec45b4f17aee691bdf4de1b32.pdf
    • https://static.usrfiles.com/ugd/4d400c_54fcb7ae9113453292729a2f0fecc27e.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5809/files/kivilowajewosaxupu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0406/files/water_soluble_fertilizers_for_fertigation.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1364/files/94350092210.pdf
    • https://cdn.shopify.com/s/files/1/0462/3925/2631/files/92108714958.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/butijizapekiregeromex.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_off0000558b.bin
9e23813a27d2227d2b660766858859f643432196a6730be9cac6036ff0c4b5dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x558B 5132 bytes
font_01_sfnt_off000066d2.bin
ddb942c89e40cd9afe6ba7ddc263de96b15629e770b827e2cf8cf5006f5f1fb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x66D2 10128 bytes