Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9f5df5c26df603…

MALICIOUS

PDF

36.6 KB Created: 2020-08-30 19:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa02c204d99bca07349e5388f9674212 SHA-1: a25adeb3e8d6fe5a634636464997c9b377861937 SHA-256: 7b9f5df5c26df60378393d17bc5bcc26660318ddbf97943025c5a52782b08e8e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/wix?keyword=buffy+the+vampire+slayer+torrent', is flagged as a known malicious redirector. The presence of a download button lure and the ML classifier's high confidence score further indicate malicious intent, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=buffy+the+vampire+slayer+torrent
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/314c35_080b251ec0bb4bc88107668137e3fd6f.pdf
    • https://static.usrfiles.com/ugd/162fe6_4867faa014754afc99a0bc9ac7018c64.pdf
    • https://static.usrfiles.com/ugd/39cb9d_2c59f42fd8624932b2d33ebd2f91884a.pdf
    • https://static.usrfiles.com/ugd/b8c837_da74cf5d45ab41b8ba8732aa2e56ac45.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5191/files/49535114485.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3981/files/psychology_10th_edition_myers.pdf
    • https://cdn.shopify.com/s/files/1/0436/2171/2034/files/reinstall_windows_store.pdf
    • https://cdn.shopify.com/s/files/1/0440/2990/2998/files/suwitukuvironuwi.pdf
    • https://static.usrfiles.com/ugd/f4de5e_361f31c654a5476b8031d29c5db0b8ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fc0f89e2a4b4142b5bfa8121ffeea1a.pdf
    • https://static.usrfiles.com/ugd/b0b521_520d66b43b094a6ea4fb2fb9826ee77f.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c185d7ccd894776b529c4e875233a88.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fe8.bin
1df24751563f4cd0cdaad94d8e491726d926c62571383a53ed020ed342ff19be
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE8 5352 bytes
font_01_sfnt_off0000620b.bin
65037b22adf34f8a6fac9e0b5ee1f0ddcdd173bb48757c4faad54fbf5eb53ebc
pdf-font-stream PDF embedded font (sfnt) at offset 0x620B 10580 bytes