Malicious PDF — malware analysis report

Static analysis result for SHA-256 34fbcf08f9e0f252…

MALICIOUS

PDF

41.9 KB Created: 2020-08-31 02:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2329287c1c6e38eb71a0cbdecf1e02b6 SHA-1: 210200ee11f844e954a4e5bcda4a2bfd79a97273 SHA-256: 34fbcf08f9e0f25213a5efca49a12050e0954a68150de05e12f697be7bfcc6bc
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of external links, with the primary malicious URL being 'https://ttraff.com/wix?keyword=the+functional+art+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs hosted on 'static.usrfiles.com'.

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/wix?keyword=the+functional+art+pdf
    • https://static.usrfiles.com/ugd/afe78f_71690cb063d14d3d97b4108a2f68b605.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1fe89458b6846199cd81dd7432a4906.pdf
    • https://static.usrfiles.com/ugd/b8c837_9096d5bc6f8d4641a47c47d913564d34.pdf
    • https://static.usrfiles.com/ugd/b8c837_40f16f11a69a442181997954451dbc2f.pdf
    • https://static.usrfiles.com/ugd/e3ff21_48527f1e1c144409951b5c74a2b67092.pdf
    • https://static.usrfiles.com/ugd/79e0dc_f24227d4726d4813952ec6ff1ad75366.pdf
    • https://static.usrfiles.com/ugd/2813e2_f9f7f31185ae493e835b945ad5b877c8.pdf
    • https://static.usrfiles.com/ugd/3e9e83_3120d6db06b146b2b1f031f08f6adf89.pdf
    • https://static.usrfiles.com/ugd/68ec51_121a29add8ea49e4a7313525aa65d22f.pdf
    • https://static.usrfiles.com/ugd/8b49c6_d5566d6b45284f3380584f60aa76f76b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5746a26cc9f74eae8e1b5bb451138be4.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_afb79525cd764552924d75289b79e1c4.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_off000065c2.bin
5f1e34520927b75bd772a0aca6db6dd4277b18268d61a691abeef7c8c86cec13
pdf-font-stream PDF embedded font (sfnt) at offset 0x65C2 5016 bytes
font_01_sfnt_off000076c1.bin
e13a7efcce0dc9a9211a6042b625a9aec67190e20127fe7409dadd7b5ba84bad
pdf-font-stream PDF embedded font (sfnt) at offset 0x76C1 10824 bytes