Malicious PDF — malware analysis report

Static analysis result for SHA-256 659dd911bec438bd…

MALICIOUS

PDF

51.1 KB Created: 2020-08-30 02:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c4ebd3c2f820e84b8a5dddce297dc6d SHA-1: 5d8970e8e30041c3c7f430241255cd65a7cafdbc SHA-256: 659dd911bec438bde451b351bb7e2e6fa3e7882a703f6d4522d6b45ec10408ab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to drive traffic to potentially malicious sites. 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/wix?keyword=Byg+en+vikingeskibsmodel
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_52d883453f4549c5a4d7035657ecbeed.pdf
    • https://static.usrfiles.com/ugd/451461_09a24cf1ecf847e48ce1b69211d84520.pdf
    • https://static.usrfiles.com/ugd/f84671_f2829a57d3b84304b4ba6cf01f0e743e.pdf
    • https://static.usrfiles.com/ugd/565485_ba15880398ba4ad48ded277affd34ac9.pdf
    • https://static.usrfiles.com/ugd/b8c837_94d27aa776bf44f5a4c7e6f533809d00.pdf
    • https://static.usrfiles.com/ugd/cc03df_9b39f47cd4754814b8bb4dfbb4973cd5.pdf
    • https://static.usrfiles.com/ugd/de02f3_84a77537437b4896a50574791c248494.pdf
    • https://static.usrfiles.com/ugd/299074_483f99c5782444df89316ed0d2fcd564.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8454/files/tivajirutobepumapa.pdf
    • https://cdn.shopify.com/s/files/1/0447/1390/2234/files/59062590937.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/refurudekuved.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/43213236452.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/monty_hall_problem_python.pdf
    • https://static.usrfiles.com/ugd/4f270c_f2762034cd6f49bf80685afc3b6769ef.pdf
    • https://static.usrfiles.com/ugd/33c377_306c6e5614d34bba99934ad7f24bafb4.pdf
    • https://static.usrfiles.com/ugd/ddb60a_9d90d61d398e458c81602c89e7df0712.pdf
    • https://static.usrfiles.com/ugd/c63dba_009af11aa5954de280567c9f72dc71ba.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a06.bin
986cffb7b87c12772ccb778310bb36676c0d082999a104ea2e3055334a5d6216		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A06 4964 bytes
font_01_sfnt_off00008ad0.bin
88f94ed188569bc7a95307c2d81d0675293d9438ca3fd7292fe49dd1e3cfd893		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD0 10956 bytes
font_02_sfnt_off0000af89.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF89 4324 bytes

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