Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e846ccf221fc02…

MALICIOUS

PDF

36.3 KB Created: 2020-08-07 02:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab2caaab4b530c5d2f6c982eee23f49b SHA-1: 23b7ec450f75d02ce7ec5f3d2b3b1a74aee8404a SHA-256: f4e846ccf221fc0220ab556b68aa7335e203c1014c7f852c73fb2605ea6f6881
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a link to a PDF answer key. The document body and heuristics indicate a link farm strategy, likely to drive traffic to the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=mathematics+in+the+modern+world+pdf+answer+key
    • http://files.suburbanhennepinhousingcoalition.com/uploads/1/3/1/3/131380354/9726478.pdf
    • http://files.golffordreams.com/uploads/1/3/0/7/130739340/8cae2cb9.pdf
    • http://files.tennesseeprepbowling.com/uploads/1/3/2/7/132740501/67ff7.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/96329672129.pdf
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/c_chrono_timer.pdf
    • https://cdn.shopify.com/s/files/1/0432/4373/3154/files/minecraft_ps4_seed_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/6649/0006/files/21547765921.pdf
    • https://cdn.shopify.com/s/files/1/0428/8489/0790/files/30685194575.pdf
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/47660031003.pdf
    • https://cdn.shopify.com/s/files/1/0434/5026/9849/files/dijidosa.pdf
    • https://cdn.shopify.com/s/files/1/0436/3508/1374/files/wepufezisivesetalifufo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/lobowurusosunibovitagadu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/jabije.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/gukazixovegegotanes.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_off00004f7a.bin
0f348934717d3f5c903064839115b3086cc6ad0f0da1bf8a4b1a21e323b1d348		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F7A 5656 bytes
font_01_sfnt_off000062b9.bin
cb3474a9133b0f0ead0a04b72909ce93bb4719953d94582ee1084555702a4d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B9 9812 bytes

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