Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a9bd25114fd9c9…

MALICIOUS

PDF

37.9 KB Created: 2020-08-29 21:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dc2ad522125ec3ea2e31b40e7f450bb SHA-1: f83e3e84f0169db7fef37f90742bf70d27b25aa1 SHA-256: 66a9bd25114fd9c907fc117b67b44f3bda97f67f14b0eae039f2e13a7328a9be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to a redirector service. The document body, though partially corrupted, suggests a lure related to a "Nautical map of caribbean". The primary malicious indicator is the link to the ttraff.ru domain, identified as a malicious redirector. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic.

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=nautical+map+of+caribbean
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/8459/2805/files/60867016514.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dazekenikajupupapunel.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5811/files/music_maker_apk_full.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0639/files/75596724751.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/71694638844.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdf
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/entrepreneurship_development_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4728/0026/files/musofovebefositulosus.pdf
    • https://static.usrfiles.com/ugd/e5a943_15489b37371c43348d7ef202859f093a.pdf
    • https://static.usrfiles.com/ugd/5a1791_51e7ba60501d462eafcad4cf576f7689.pdf
    • https://static.usrfiles.com/ugd/b8c837_45da52d625c44efcb53d7e24afddb6c0.pdf
    • https://static.usrfiles.com/ugd/36f25b_e5ea9f405c284ca48772b3342e294d0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c07a62cfc9d34878b09ee2c189b8d570.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047b2.bin
fb5b8de49640d2ba99f769bed5ab613f8949ae6622283c101d0e780ac313d389
pdf-font-stream PDF embedded font (sfnt) at offset 0x47B2 4972 bytes
font_01_sfnt_off0000587f.bin
97e1a8b0e68b07887ae0336ea0b66899db2b966bb419336b1e40ec73c25446ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x587F 10288 bytes
font_02_sfnt_off00007b91.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B91 4324 bytes