Malicious PDF — malware analysis report

Static analysis result for SHA-256 e945429a7ff5cd9f…

MALICIOUS

PDF

33.6 KB Created: 2020-08-31 13:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1be9eb7bfc7aab5c7c39371f182e2b3c SHA-1: 01fd9d74e3e49672fdfc3255b1747d0a2aedc7a9 SHA-256: e945429a7ff5cd9fc2ca6b00cc9c3c548683f200b13cb8ba3274afee2da45c39
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though partially corrupted, contains text related to a movie theme and a URL that appears to be part of a link farm designed to attract traffic. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to redirect users to potentially harmful content.

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=kaththi+movie+theme+free
    • https://static.usrfiles.com/ugd/b8c837_bf9afa210ccd4576ace0f8eb31f8251d.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f9647ba841a420b8c60fec99e31e2db.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc95d66fb11e42509a72a70f3bc28c94.pdf
    • https://static.usrfiles.com/ugd/b56239_250ff3705b8e46e9a20aef5bf4275845.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7dff08cdc934edf9583b34df90f6ec4.pdf
    • https://cdn.shopify.com/s/files/1/0429/8109/7631/files/19914447997.pdf
    • https://cdn.shopify.com/s/files/1/0461/9848/9246/files/bossa_nova_dance_performance.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50751207741.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3924/files/8190793376.pdf
    • https://cdn.shopify.com/s/files/1/0432/3944/0543/files/wuwajoxagopofalini.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6048/files/pekupozagabazij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31903895201.pdf
    • https://cdn.shopify.com/s/files/1/0441/2165/3400/files/autoenginuity_scan_tool_software.pdf
    • https://cdn.shopify.com/s/files/1/0429/3971/1644/files/17635273247.pdf
    • https://static.usrfiles.com/ugd/912de2_6ffaf94259a148688c1314479cd461da.pdf
    • https://static.usrfiles.com/ugd/b8c837_5275b60d53e04940a0f0ca0851ebc307.pdf
    • https://static.usrfiles.com/ugd/3615fb_2f6de8a19e874eba8adcae6e064f140d.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_off000048da.bin
4921b220a8e44cb847c2e39aff9eb9d8c74551fde31b216bfb11519cd05357d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48DA 4828 bytes
font_01_sfnt_off00005926.bin
8c73d53e67840c1b282e3a0534b509f969e1d8f396bce8159707dc8bf47bfa1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5926 9448 bytes

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