Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4b79f1c72ff80f…

MALICIOUS

PDF

49.0 KB Created: 2020-08-30 07:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e070f6fc92a2bc85427b0cdf78fd0db5 SHA-1: 1e2ccb02a15ab0cfcd6adce559f691f791857526 SHA-256: ef4b79f1c72ff80f5be9c8112643166c701553a3431094ab43fc3c5c498f3d1c
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 'https://ttraff.ru/wix?keyword=i+cant+quit+you'. Additionally, another critical heuristic indicates a PDF link farm, suggesting an attempt to manipulate search engine results or distribute multiple malicious links. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent.

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/wix?keyword=i+cant+quit+you
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/joponevig.pdf
    • https://cdn.shopify.com/s/files/1/0440/2138/3333/files/lidexazoli.pdf
    • https://cdn.shopify.com/s/files/1/0432/9370/4350/files/32861479909.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9617/files/77430410100.pdf
    • https://static.usrfiles.com/ugd/40b9e6_54ec37a42a3142669fcd700df27f4d3d.pdf
    • https://static.usrfiles.com/ugd/69b86f_0fecfb95649a4a41ba91539f2f004bec.pdf
    • https://static.usrfiles.com/ugd/b8c837_fca9b70c27e743ee82280ac60cf0ac31.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5f0b8d127c7440aa11bdf2ae9256a3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5576bb4e82e473a9abac39e90c939a7.pdf
    • https://static.usrfiles.com/ugd/f1780b_57165bd3522840068dcdd718c3110c8f.pdf
    • https://static.usrfiles.com/ugd/225520_2a61b94ec59443c9af7f1cc7511ddcda.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed426657fc0c469bba22da7019b26597.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/cours_administration_systme_sous_windows.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/39361835754.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/78349272326.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/
    • https://cdn.shopify.com/s/files/1/0440/2138/3333/files/l

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dec.bin
2bd651e4a5bea49521e66eb691943757e42934c765e350e9ea092a14a2a84284
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEC 4652 bytes
font_01_sfnt_off00008ddb.bin
b98f713a378771c78015d575023c939e929ff68b191eccbf2bddcf4b301b105b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDB 12640 bytes