Malicious PDF — malware analysis report

Static analysis result for SHA-256 d128cb8b82bca516…

MALICIOUS

PDF

47.2 KB Created: 2020-09-01 09:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f12023e3ba3f86914110e815ea291b3f SHA-1: 4146bf9371dfa5c0e25431bbe2c78fdd2f293e78 SHA-256: d128cb8b82bca51652144170d739fd54c1b7a0c361cfb56d2726d9e7eb3bf881
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to legal proceedings and also includes the malicious URL. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of a link to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=answering+interrogatories+in+federal+court
    • https://static.usrfiles.com/ugd/76de1a_0f9e510ece8e456e952224aaf38d766b.pdf
    • https://static.usrfiles.com/ugd/99a8f2_869dee0e34f04fa997d6d4dd1d022374.pdf
    • https://static.usrfiles.com/ugd/a91264_96c4ce3b237446fc82a75b2b88cf4b09.pdf
    • https://static.usrfiles.com/ugd/10b11f_9595b014b4964d788464618e375373a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_2526511def294fe18bce66adcfdb3219.pdf
    • https://static.usrfiles.com/ugd/73c254_21ace8ee1c1a447f92740fa8b2d9245d.pdf
    • https://static.usrfiles.com/ugd/1df9ea_1ade6ef7fee34e158abf40e9834832fc.pdf
    • https://static.usrfiles.com/ugd/d54300_b5abebc528a745f48a07c63586bc07ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_1868644f22254e8fa3d860ac5f3c841c.pdf
    • https://cdn.shopify.com/s/files/1/0434/5095/7974/files/rurunenuvutapakawezor.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7894/files/51241617391.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/megol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7430/files/lord_of_the_rings_minecraft_mod.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_off00006f10.bin
3f937487ef252b37ae3d5078f92aa8254afbbdc9431ddd80793233f1f91f6127
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F10 5152 bytes
font_01_sfnt_off000080ab.bin
7d487f966fdcd091bb938e1f1f2b7685b021a1f2573fe7b18edf6b697adc807f
pdf-font-stream PDF embedded font (sfnt) at offset 0x80AB 9664 bytes
font_02_sfnt_off0000a1af.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1AF 4324 bytes