Malicious PDF — malware analysis report

Static analysis result for SHA-256 425651cf9a9178c8…

MALICIOUS

PDF

39.6 KB Created: 2020-08-11 21:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1334613b64c94902c2c1a033a2038d89 SHA-1: 744ca47216fc9f054d26e98785b9342cad09bb2e SHA-256: 425651cf9a9178c88a9f23767045665c1efa937d2b961f2a6c1b4f660983704c
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for delivering malicious content. The document body, though heavily obfuscated, appears to contain keywords related to free book downloads, suggesting a lure. The presence of numerous embedded URLs, including a link farm, further supports the malicious intent. The ML classifier also strongly indicated 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.com/pify?keyword=all+urdu+islamic+books+free+download+pdf
    • http://xujisiki.erikgjesfjeld.net/uploads/1/3/1/1/131164312/tonatuvenir-bavuloxo.pdf
    • http://sekoxali.geekykinknewengland.com/uploads/1/3/1/4/131452883/kiwewokeferufodiwok.pdf
    • http://files.tilliesnevada.com/uploads/1/3/1/3/131379612/xapixivote-pipugu-neruxesivalu-wifuf.pdf
    • http://files.juniortravelers.com/uploads/1/3/2/6/132696598/e93b200cd7be1.pdf
    • https://cdn.shopify.com/s/files/1/0441/3367/9256/files/hydrology_a_level_geography.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4013/files/nstm_555_revision_13.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/noxanitudoruvavexuruw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0491/8941/files/wiroxepuzedadejig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdf
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/roblox_island_royale_script.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8274/files/artificial_insemination_in_dairy_cows.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6731/files/56074772093.pdf
    • https://cdn.shopify.com/s/files/1/0433/9476/0862/files/15941362489.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/67015841766.pdf
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/xuluserazokiwepedefivu.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_off00004831.bin
fb2a78c72ad20aa418a9fe3a4cb8bfa3402a32dfdffe82e8045ce7c493b0af04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4831 5588 bytes
font_01_sfnt_off00005b1c.bin
66080a64653d33e13600a205a175bdd825cda4a3176dd939b2f9cd94cf2d1291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1C 9736 bytes
font_02_sfnt_off00007c78.bin
ddba3217f58172b9153fa2e17a6755d454371157efde6935f0723efb148e6ff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C78 16068 bytes

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