Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a9901acbd8cd7d…

MALICIOUS

PDF

39.3 KB Created: 2020-08-29 18:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db27143cb0ac3d116e3312acbc2a8f9c SHA-1: e76e5df678caf2047a82971adabf7e4f129a0099 SHA-256: d5a9901acbd8cd7d4974f56e4debfeb821acef1645cb9540f4885a5fae198def
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised as a job interview lure. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external links, many pointing to user-uploaded content, suggests a link farm or redirection strategy. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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.cc/wix?keyword=senior+contract+specialist+interview
    • https://static.usrfiles.com/ugd/b8c837_5c6cbe1d631246d2b27c5c00f0925dff.pdf
    • https://static.usrfiles.com/ugd/b8c837_12985fe92d964c679b808b2fc07d15e6.pdf
    • https://static.usrfiles.com/ugd/9e41f0_352d376a33434119a027e064c5fc8833.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/the_motley_fool_investment_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/54492496517.pdf
    • https://static.usrfiles.com/ugd/b8c837_e224d62e4625486586df7525c34f32e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdfd312934db4f7abe1f82318d54d2ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0cc46f18ff542b3bfe17710fee3003e.pdf
    • https://static.usrfiles.com/ugd/b8c837_599af717375b49ce8ebeaa38fab98f12.pdf
    • https://static.usrfiles.com/ugd/0a0016_587b683a09dc428281e3c4e69c07e068.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/39861341667.pdf
    • https://cdn.shopify.com/s/files/1/0432/4517/4939/files/latutevikokibopimejad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0340/3678/files/zuvijovilabujog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8861538602.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005024.bin
43665094b26b9b3474e1f23488aace59f7374aaf3f55afa318e8e30806f9a99b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5024 4972 bytes
font_01_sfnt_off00006111.bin
76f1acde0eda04dc84c543326a5915b39af57c8d44ea0c86bcec7707beec74f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6111 9680 bytes
font_02_sfnt_off00008224.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8224 4324 bytes