Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f0637f26aac288…

MALICIOUS

PDF

42.6 KB Created: 2020-09-02 16:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2e9f604ca85e26fab5e90267c2604f8 SHA-1: 469193906af90a115ad09f4b2d6d644a14de9ac3 SHA-256: 24f0637f26aac2882717b99913f3a4d64a787bbc10b7d4cfc4737e59e54de0e0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains embedded links that are part of a link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to '10th board exam date sheet 2018' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly indicates maliciousness.

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=10th+board+exam+date+sheet+2018
    • https://static.usrfiles.com/ugd/2d797c_56afd5d823974e09b4a06c55233c4e3e.pdf
    • https://static.usrfiles.com/ugd/485053_de3e047aeb944aa7b87b3a3581d04712.pdf
    • https://static.usrfiles.com/ugd/1decf9_61a16ac58a4847ab9df6b5adbd9aec27.pdf
    • https://static.usrfiles.com/ugd/c345b0_a027705f47564e2cbfdd14ec37ecadff.pdf
    • https://static.usrfiles.com/ugd/111c46_aa4b61ddaab64f56953da281cc73568e.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/64627127384.pdf
    • https://cdn.shopify.com/s/files/1/0463/2166/4160/files/essential_mathematics_for_economic_analysis_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0429/5517/8150/files/wogukoni.pdf
    • https://cdn.shopify.com/s/files/1/0438/2942/8384/files/pifaxape.pdf
    • https://cdn.shopify.com/s/files/1/0433/9272/9246/files/petavebinanuminun.pdf
    • https://cdn.shopify.com/s/files/1/0437/2591/4277/files/novivenowizamogafuvewo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/puxuxupag.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/73630289041.pdf
    • https://static.usrfiles.com/ugd/0b46e6_f69d4eacd73b4539a0f788aa0414a588.pdf
    • https://static.usrfiles.com/ugd/1ee69b_ac89e4bf9fdd4f2e875961e95966fe69.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_off0000665c.bin
b3649baa51e9fa3a22fb2fd4e310852fcc3bd78cb7ad54287fa9144a26237c90
pdf-font-stream PDF embedded font (sfnt) at offset 0x665C 5664 bytes
font_01_sfnt_off00007975.bin
3a8bf8d03e8c1beb8be0d5918c1ee55c0b4f5e0ac3a73d034e4094822b8d7e42
pdf-font-stream PDF embedded font (sfnt) at offset 0x7975 10652 bytes