Malicious PDF — malware analysis report

Static analysis result for SHA-256 832a82ae08149bc9…

MALICIOUS

PDF

54.2 KB Created: 2020-08-20 08:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33e5cff4c537766e1f6f0c08f60a1e72 SHA-1: 0bcb87a9f0294a634814800baedcc0a91d17a27d SHA-256: 832a82ae08149bc9a5b2d2858ef18c6260245d91a50c265ce9b5a948cdfeaefe
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body and embedded URLs suggest a lure related to search engine optimization or content farming, aiming to trick users into clicking the malicious link. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=languidez+significado+ejemplo
    • http://files.cinnamombakery.com/uploads/1/3/1/6/131606056/9eb24027b0.pdf
    • http://files.clowninstitute.com/uploads/1/3/1/4/131407067/foniwiwaw_dojizarilefef.pdf
    • https://cdn.shopify.com/s/files/1/0431/7442/8827/files/86082889695.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7500/files/wisovuzozipeludux.pdf
    • https://cdn.shopify.com/s/files/1/0433/7352/7203/files/manobuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7488/7573/files/acute_respiratory_distress_syndrome_jama_2018.pdf
    • https://cdn.shopify.com/s/files/1/0434/1291/4332/files/games_y8_football_league.pdf
    • https://cdn.shopify.com/s/files/1/0427/5788/2022/files/lisaxujudozigolamesefib.pdf
    • https://cdn.shopify.com/s/files/1/0433/8994/3975/files/76154176768.pdf
    • https://cdn.shopify.com/s/files/1/0430/9912/7959/files/71101728814.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058d1.bin
06fb5684724cdb92e799355d70f86848465401b17b200764cf67267f58c29f6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D1 4276 bytes
font_01_sfnt_off00006825.bin
8c6ba3a2249993045600ccfca489a24b8e7b0dad18ab6d1b5dcd67b2ee9177bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6825 5444 bytes
font_02_sfnt_off00007ab1.bin
a227862735a5bc3e777ba84532bc763eccc025b50dce67894d0a738621a82c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB1 3700 bytes
font_03_sfnt_off000088d2.bin
315abf144fcd4488836b6a53d87e12cb0ee6aae659d0c1cf1ddd75d0cddd10eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88D2 4588 bytes
font_04_sfnt_off000097b1.bin
cbc059ecb012a5980d7d9bc8b7e2dfe9dd6106fb60e0162270c785c8fb2c56c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B1 11872 bytes
font_05_sfnt_off0000be4b.bin
59a9eafad56028e59bca90355ea815324c4b8224702e4d8779317f8c0b936efc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4B 3272 bytes

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