Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af0bd5c73a56031…

MALICIOUS

PDF

43.1 KB Created: 2020-08-31 15:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e2975c628f22fdd3c6a1a97047bef5c SHA-1: 5d25221d72090deaf89570c9412796f1333f7bd7 SHA-256: 4af0bd5c73a5603159a6f2f8e79d1029748564bf8418bce7afb05bd02451d76c
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, appears to contain the same redirector URL and a list of other PDF links, suggesting a link farm strategy. This pattern is commonly used to lure users to malicious websites for phishing or to download further malware.

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.link/wix?keyword=carr+manor+community+primary+school+uniform
    • https://static.usrfiles.com/ugd/8b49c6_37544b31b07f400bb8c5396273e5393b.pdf
    • https://static.usrfiles.com/ugd/37321e_ca5bca8dbf7e40cdbb8956c242868f02.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f430eee9e9b442993b1fc04c3d562ac.pdf
    • https://static.usrfiles.com/ugd/eaf48f_3ce8d4c8b3ff44fe91fe5f0d5dd78d06.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9560fe978a64ad4b5fc856066c55de3.pdf
    • https://cdn.shopify.com/s/files/1/0435/2737/2955/files/letenubov.pdf
    • https://cdn.shopify.com/s/files/1/0429/6930/1151/files/16316830863.pdf
    • https://cdn.shopify.com/s/files/1/0440/7849/7944/files/gogutaxifatezogekot.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/kiziwapukafazulosefezev.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0597/files/55983728335.pdf
    • https://static.usrfiles.com/ugd/b8c837_e36fb5fe9e074d02bd5680be6ef6f5ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_465834261f1a4a1bbbc1499ece75266f.pdf
    • https://static.usrfiles.com/ugd/7198c1_4de2e0bb742b4dc78ac20536a63ef6ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_92460ea311c6494fae54c155528fd7d6.pdf
    • https://static.usrfiles.com/ugd/455f95_b8eca8423e7249eca93fdf9d712e22e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_10c490bdd8774643ac54b12024c3efec.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8f515ed025f444ca9253b004ccc4c05.pdf
    • https://static.usrfiles.com/ugd/0d2908_0c9c7ab284834e7ebd72a763ecf93b12.pdf
    • https://static.usrfiles.com/ugd/b8c837_685e6e7e134f4a919a8b7a6397fee393.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_off00006804.bin
e1c402dd856fe450dc1a3c67f68f8422015b6f330c04faf13ecc0319e520061e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6804 5260 bytes
font_01_sfnt_off000079c6.bin
9b4d3158cecf11039c47af0a8062a103204b9baa3745f65643ac5697eeb80908		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C6 11532 bytes

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