Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b030742b53ed595…

MALICIOUS

PDF

61.2 KB Created: 2020-09-02 18:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbd24353ce5fd5bbbb62517bd80a971b SHA-1: 9933fe62eb8c3d627a5afb7340cfcbbc03f805a4 SHA-256: 5b030742b53ed5954ac00b6eba34d76b23865dcd3a6c6702410120b8560492ac
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm hosted on Shopify, but one critical link redirects to 'ttraff.club', identified as malicious infrastructure. The document body, though heavily obfuscated, contains the text 'Brothers in arms guitar pdf' and the malicious URL, suggesting a lure to download or view content. The ML classifier strongly flagged this PDF as malicious, and the presence of a malicious redirector link indicates an attempt to lead the user to a harmful site.

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=brothers+in+arms+guitar+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/5152/1947/files/93692771623.pdf
    • https://cdn.shopify.com/s/files/1/0433/9744/7836/files/sonic_ethers_unbelievable_shaders.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6070/files/abecedario_con_imagenes_mayusculas_y.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/77214252917.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a39c6296bda4a19bf40b2d4a636c05f.pdf
    • https://static.usrfiles.com/ugd/87fdc7_ffa12fd1d48d49b695ec5afea9fd6ec6.pdf
    • https://static.usrfiles.com/ugd/a298ce_847a97b4b7414fb69fd29b103e5c3e67.pdf
    • https://static.usrfiles.com/ugd/7c3584_86694ea547294f7eb8d3d3c820229259.pdf
    • https://static.usrfiles.com/ugd/a43ec6_ef9bfb34a31c4de2a4956a37023e939f.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_30c85c70a0f2409686ad596b67c4d2dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_905a349e35e3427d888c29e42dddf4a6.pdf
    • https://static.usrfiles.com/ugd/957c7b_ecda1582c08942fdbe1e6cd225fbb90f.pdf
    • https://static.usrfiles.com/ugd/a18aa6_81e0a96a186b4fd4b3a45b7db495366e.pdf
    • https://static.usrfiles.com/ugd/fbccce_74eeba281f7e4edb915554f47f3bc482.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9f6869b972445329dbd2fbf0133938f.pdf
    • https://static.usrfiles.com/ugd/44b221_95b98c8fa10c4252b368761ff3221e42.pdf
    • https://static.usrfiles.com/ugd/9eb187_b14a777e7808432e8bb1f1c36b87082b.pdf
    • https://static.usrfiles.com/ugd/7dfe85_a49fbbf903b440c1a7177a1f7527306e.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_off0000b037.bin
8d218ad7a39888354c2d0ed5d8032adbea38ecf5c65d1b088c3dd6440f44cb62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB037 5472 bytes
font_01_sfnt_off0000c2a8.bin
b3a3dd72ac473703f94481ba1f45555d39253848f4a57a8dd7c774066fc1b028		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A8 11004 bytes

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