Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e309762c2498b9…

MALICIOUS

PDF

44.5 KB Created: 2020-08-30 21:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1fce092811a324bc450eaef1fcb568e SHA-1: d58d4f7598e8bbcefb24d8df2930e16e9b935ce0 SHA-256: b7e309762c2498b9ee6c4903c4fa54ea03cdc2e3a8f0206d791173dffa254eb1
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and references to 'download', suggesting a lure. The PDF also contains a mass external link farm, with many links pointing to 'static.usrfiles.com', indicating a potential SEO poisoning or link farm strategy to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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=the+weeknd+acquainted+download
    • https://static.usrfiles.com/ugd/76de1a_637aca2604d94a87975183e64093c7a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_0abcaceee78f4e7dbff6621253b4b752.pdf
    • https://static.usrfiles.com/ugd/b8c837_8614395f95f14a9492019aaa4f76754e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c93d21e7dd764e2ea686265d444ccb34.pdf
    • https://static.usrfiles.com/ugd/b8c837_17772981c6da43f3936d302466e8daf8.pdf
    • https://static.usrfiles.com/ugd/6da380_9e0699bb4001476d91cd0cd6226434a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0accbc53ea149d38056e2367b498ef8.pdf
    • https://static.usrfiles.com/ugd/b8c837_52933629e3ff42baba02a9213fd63f7c.pdf
    • https://cdn.shopify.com/s/files/1/0430/2084/5210/files/43853599655.pdf
    • https://cdn.shopify.com/s/files/1/0439/3818/5384/files/81202280859.pdf
    • https://static.usrfiles.com/ugd/822ecd_9ade3470b355420ea64499bf40d629aa.pdf
    • https://static.usrfiles.com/ugd/696b8a_1bacb7b7034243038517adfe9aa4cbe0.pdf
    • https://static.usrfiles.com/ugd/8e1900_03e176d19b4c47cbbae741876bb86863.pdf
    • https://static.usrfiles.com/ugd/4b7290_d9627e43c6ce4d90a2ea937f7d2ad35b.pdf
    • https://static.usrfiles.com/ugd/353d00_437c82b6d16148d5aece00cd78e6c776.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_off00006318.bin
4749ac1ef10f4b23e5dcd77f7e0d4b4974efe1240247cd22f48b0c9d05edc062		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6318 4864 bytes
font_01_sfnt_off000073a4.bin
96cf5dc213e4a9df20dbf25c6795946eb2f449be67a0b5ff83c7feefbef76fbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A4 10304 bytes
font_02_sfnt_off000096de.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96DE 4324 bytes

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