Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c6f6dff30dd533…

MALICIOUS

PDF

46.6 KB Created: 2020-08-31 22:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f6ab5171e1340492f286cb471d68ba SHA-1: f9ee1e414ecf7a535f732e9398a1e86dd92a208d SHA-256: 24c6f6dff30dd533b5472d53c00eef6c5d910f5e086b971b571695b173c060b6
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a large number of external PDF links, characteristic of a link farm. The primary malicious URL identified is https://ttraff.link/wix?keyword=cv+resume+website+template, which is likely used to lure victims with a CV resume template theme. The document body, though heavily obfuscated, contains this same lure text and the malicious URL.

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.link/wix?keyword=cv+resume+website+template
    • https://static.usrfiles.com/ugd/516574_243e13ec0bf0471c94f84b392f896c07.pdf
    • https://static.usrfiles.com/ugd/64d889_6ed24e11d9ff49a9bebef3d001191963.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd1238f0b46d4037a71f11897567eaff.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f6e0a5b89b14037a7c44b6d91043543.pdf
    • https://static.usrfiles.com/ugd/10b11f_6a56d4cab190402386ceca4835b42f9a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f5ba125a79c4493881924967ba8e647.pdf
    • https://cdn.shopify.com/s/files/1/0445/7899/6383/files/bangla_song_lyrics_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/79087598445.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9590/files/vudotemudunixufaxi.pdf
    • https://static.usrfiles.com/ugd/b7082a_8b166ef959374443ac8ddcd274b0ec7e.pdf
    • https://static.usrfiles.com/ugd/cafc24_67aa2d9533eb4ad4b96ff62f93c526a2.pdf
    • https://static.usrfiles.com/ugd/3b7182_cb01458f943b47718951374323fc9f00.pdf
    • https://static.usrfiles.com/ugd/cd79e3_b9dccae2fa42464891120f9cd093df78.pdf
    • https://static.usrfiles.com/ugd/5e81b9_3f779b5972344638a6c72db8d2b36870.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007790.bin
ebba24ff246ee91517372f5e021cbbe426732fee0163614713d74dcc423374b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7790 5164 bytes
font_01_sfnt_off00008913.bin
935c48ab374822cc7c37ccf809d96b38565d52e3f3181410a7ff8bda2299d3ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x8913 10652 bytes