Malicious PDF — malware analysis report

Static analysis result for SHA-256 66db8102f726543a…

MALICIOUS

PDF

77.9 KB Created: 2020-08-21 13:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83c902f70d719de0c0ee97c821df03ec SHA-1: 8d1a8a95990468914092dd17c648b344deb7cae6 SHA-256: 66db8102f726543a69a4d793f37e12d9bbe089243e026f118d22f4f925d55b7e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service designed to obscure the final destination. One such link, 'https://ttraff.com/pify?keyword=roblox++chromebook+os', is flagged as malicious. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a malicious campaign, likely for phishing or malware distribution.

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.com/pify?keyword=roblox++chromebook+os
    • http://degap.masonmansungkang.com/uploads/1/3/0/8/130813604/cfa4e8819a179.pdf
    • http://files.artistoday.com/uploads/1/3/1/3/131383325/901d080415.pdf
    • http://zawonis.jamilamikhail.com/uploads/1/3/1/4/131482962/kubusisex.pdf
    • http://files.nostrings.co.nz/uploads/1/3/0/8/130874382/xemuvag_kumedo.pdf
    • http://files.dingerdivesin.com/uploads/1/3/1/8/131859261/b1ca063f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0806/4677/files/devuxigiribizit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruketisoren.pdf
    • https://cdn.shopify.com/s/files/1/0431/0096/2967/files/rsa_python_code.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/rookie_blue_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0428/6133/0591/files/sewifewulegirivadiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43545787384.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/garuvekekubipumixakirami.pdf
    • https://cdn.shopify.com/s/files/1/0438/3332/7776/files/16096498158.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/58260591889.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/81906974847.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1357/files/10309320334.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_off0000f41d.bin
44cef36c380d7f02286eb9d71a0ab867917192df21d7799606930e55a5b9d6eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 5108 bytes
font_01_sfnt_off0001055d.bin
191a78ad90e1933943d7d6cb68600250f88c006ab99584423a608656b1dce37f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 10972 bytes