Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a186357b859a4d2…

MALICIOUS

PDF

40.6 KB Created: 2020-09-01 12:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08f2f53d04d84a8be89b09124e25a617 SHA-1: dd529a0834f0f0a2518186bbd5c57833928fe141 SHA-256: 9a186357b859a4d2ae8a16edd71bf8e20f310f17ebc2655d8326f099f0df6e15
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, a technique often used to create link farms for SEO manipulation or to obscure malicious destinations. One of the primary links, 'https://ttraff.me/wix?keyword=platform+revolution+slideshare', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links.

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.me/wix?keyword=platform+revolution+slideshare
    • https://static.usrfiles.com/ugd/b910ae_1fa5089f391e43b49a2d99e76d69cd0f.pdf
    • https://static.usrfiles.com/ugd/daca0d_a92c023863584cf0851537f3313a1112.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1aa8c06de6f4350ba4ba10d481d326e.pdf
    • https://static.usrfiles.com/ugd/764aaa_d3aadc6c788849af85dc7eb671a80c74.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/82917377189.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7284/files/daxaxu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1891/7787/files/mujexinotol.pdf
    • https://static.usrfiles.com/ugd/3649d2_6fd54fcb0d204808a424ab562a133e6a.pdf
    • https://static.usrfiles.com/ugd/ed64d2_3bbbe877f7e44d8c8ae86cbd9bb21883.pdf
    • https://static.usrfiles.com/ugd/23e9be_85f156b6cff4411a8226ef193c32327c.pdf
    • https://static.usrfiles.com/ugd/d902bb_0b8cc6e1dd334a5ba252a5a340c306a2.pdf
    • https://static.usrfiles.com/ugd/88a84f_ee62d67ef69346609be4270eb1bb33de.pdf
    • https://static.usrfiles.com/ugd/4c1554_68ee8dae08444840ab5d5649254dd31f.pdf
    • https://static.usrfiles.com/ugd/fd3290_a8fc826d74ae497cb10c2b0f12c14c87.pdf
    • https://static.usrfiles.com/ugd/bf07b1_5719cdfed89145b9ae54c9188d734273.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_off00005fdf.bin
84df324c252593d3129833ab7d5c1ab91faf88d80716d6c6eed07e38855fcf15
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDF 5208 bytes
font_01_sfnt_off00007171.bin
2d78dfb91dc649579842c20d8a334d0eb84b1a3e9f7b6ca0b9970b4c7742aeed
pdf-font-stream PDF embedded font (sfnt) at offset 0x7171 10496 bytes