Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fd1fe5ebbab614…

MALICIOUS

PDF

46.5 KB Created: 2020-09-01 20:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4609cb4097bbd4b2d7d754f1bbf0790 SHA-1: 33238fe17c01a017bfe51915dd267bf084daca37 SHA-256: d4fd1fe5ebbab614ad61bb9b4d13fc9c7ce913034cb3c443522041d69d9e0829
152 Risk Score

Malware Insights

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

The PDF contains a link farm with 13 external links, including a critical redirector link to ttraff.cc. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent. The primary goal appears to be redirecting the user to malicious infrastructure.

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=arua+chaula+duba+odia+song
    • https://cdn.shopify.com/s/files/1/0430/2890/6138/files/rirunozukuxavibemasik.pdf
    • https://cdn.shopify.com/s/files/1/0447/6711/7463/files/nupupixilovikujugefofaru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lujodegiduwidixerilaji.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/kegofosipitolobezizatav.pdf
    • https://static.usrfiles.com/ugd/b8c837_3daa7cc62bae48708f7609399e071a1b.pdf
    • https://static.usrfiles.com/ugd/07625c_753fdae421b746b1b636fa8e2f5fa0b5.pdf
    • https://static.usrfiles.com/ugd/158fb9_d1753461ce72444daeec6c08d90590cd.pdf
    • https://static.usrfiles.com/ugd/625844_a00d4d9c2c67494a8477ac05de264331.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f066c0bc46c47048f988b9d4575c723.pdf
    • https://static.usrfiles.com/ugd/89064d_531951b4d3ab4432b8ecff2f2f8fab64.pdf
    • https://static.usrfiles.com/ugd/67e251_672201a2abc74ff4b39b6756dba66622.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecb7db2ebfd14b9392d61fde998c4381.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_c769a47a641541338ecb2d19052490a6.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_off00005ba3.bin
f9e68f8b987088145baddc4a655a7f3c888e3ed3028f5e9235b66d2c9409a6f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA3 5328 bytes
font_01_sfnt_off00006db3.bin
e2ebfae16edffca7b33b8218d3f30ab57dc5786401a8c2b84790abcb1ab494a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB3 14224 bytes
font_02_sfnt_off00009a79.bin
6f301f2f67f404e8dcb34b8464e1c73c7f3479ca567af44a87d64f1461861cc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A79 5124 bytes