Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b0012688b3670f…

MALICIOUS

PDF

53.1 KB Created: 2020-08-30 20:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c58b42156f03da05a769ecf91dfc5b3a SHA-1: 589fcf6602355349790b0d903c1025ec59e1fc5a SHA-256: b4b0012688b3670fac28eab61556e20fec5e99f03dba500965c0b702e57cf414
152 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=evli+%25C3%25A7ift+sorular%25C4%25B1'. Additionally, a PDF link farm heuristic indicates the document is part of a larger infrastructure for distributing links. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the embedded URL is the primary indicator of 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=evli+%25C3%25A7ift+sorular%25C4%25B1
    • https://static.usrfiles.com/ugd/067ecb_5b0a8e9e9e3e4599b8843d357fad2c68.pdf
    • https://static.usrfiles.com/ugd/e2c250_13f971172bb54243adee1b1819bef8d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb74411209b34f72a253845f1bf135b1.pdf
    • https://static.usrfiles.com/ugd/6d59ab_c09f21745bf34d09af2546c431a4138f.pdf
    • https://static.usrfiles.com/ugd/79cb75_bb3e54df637845fa8cd3ec141c2ada3d.pdf
    • https://cdn.shopify.com/s/files/1/0433/7070/9150/files/rexedude.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/advanced_wastewater_treatment_process.pdf
    • https://cdn.shopify.com/s/files/1/0440/4844/9701/files/x_mod_games_free_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/8930/4477/files/nenodokajipezakox.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/pevaxepiturikobawev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sexewagufik.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/dulasojefum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bf9.bin
b116324bcbeb1396193cf31b376d0cddac19ef1a60cf926053e4e1bfeb43da29
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF9 4992 bytes
font_01_sfnt_off00008d0d.bin
1f7d698bb0beba8c842f4b04722a7542dfad5ca509232c12935afdb37df8452b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0D 11104 bytes
font_02_sfnt_off0000b099.bin
4a5c36e67cb0cf2203a49150b964b9f69f6d5e64ef997a84c22f8d018363a7af
pdf-font-stream PDF embedded font (sfnt) at offset 0xB099 16224 bytes