Malicious PDF — malware analysis report

Static analysis result for SHA-256 1191f60ba1b29226…

MALICIOUS

PDF

38.6 KB Created: 2020-09-06 18:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fef4d95fda1ea7bb1ff5e508a03da83 SHA-1: 300ab079278e55805215fbb8f310d10764ffb84a SHA-256: 1191f60ba1b292262a3b11da4bfa7751925ba1decfba99a2f98d8918e3b349cf
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. The document body, though heavily obfuscated, contains a URL that appears to be the same redirector. The PDF also contains a link farm heuristic, indicating a large number of external links, many of which are benign but serve to obscure the malicious one. The ML classifier strongly flagged this PDF as malicious.

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.club/wix?keyword=active+and+passive+voice+pdf+grade+6
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/4b68be_59b21df4f107483aa9e12477dbc62bed.pdf
    • https://static.usrfiles.com/ugd/a48928_a3ccc9806bde4c1f90ed23dba967daa2.pdf
    • https://static.usrfiles.com/ugd/8c0e65_1d24c73855cf43f088b07b3cea89b5fa.pdf
    • https://static.usrfiles.com/ugd/3d7af5_b34c449afff345c7abc6a3474bd8df04.pdf
    • https://cdn.shopify.com/s/files/1/0434/2228/5976/files/83067481647.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/foxuvemonetewolebu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2588/9442/files/58901567710.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/ragisuga.pdf
    • https://static.usrfiles.com/ugd/9edd50_825a5fc0fb2b456db354de44aef857eb.pdf
    • https://static.usrfiles.com/ugd/bb13a2_26ca72eb6efb482eb4b1c737fca9107c.pdf
    • https://static.usrfiles.com/ugd/b8c837_df74697b77a84e788a2804d7b87b6e6c.pdf
    • https://static.usrfiles.com/ugd/10b11f_d5b91c1f7bcb44c09082f6bde8e24350.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e2c51bd73404a989aa91434f55decf8.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_off00005860.bin
447e79578b8c11a91c248f6f6ff882381f0b93aa6cda69bd7472f9c0d4c4762b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5860 5496 bytes
font_01_sfnt_off00006b30.bin
31de452a9d375849b4ed28d11f8d8e21c4263dbbf213478e97f5f195563b4dbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B30 10164 bytes