Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e06089cbfac5db…

MALICIOUS

PDF

64.7 KB Created: 2020-08-30 18:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f116c87baa11ca34893575df996625ae SHA-1: 50cfe9cbc84fd9928e5c58a37b8fa2baddccae7f SHA-256: 23e06089cbfac5dbdbfa932e076377ac2577b841c11679dde36aa9eb3166a60a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=local+anaesthesia+in+dentistry+book+pdf'. This URL is presented within the document body, disguised as a book download. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious.

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.cc/wix?keyword=local+anaesthesia+in+dentistry+book+pdf
    • https://static.usrfiles.com/ugd/63022f_00b56e6771b7438486dcb1b7d29e5206.pdf
    • https://static.usrfiles.com/ugd/837d34_9ce29b38b6b64fc08e99af97c85f58e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c9de2977ed9473f9ca2104f0a1bf192.pdf
    • https://static.usrfiles.com/ugd/7598fa_7855c311389a43f08e9e874e1e25f7df.pdf
    • https://static.usrfiles.com/ugd/b8c837_85251ad486794e26b62a980bd3aacaf1.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3117/files/form_feed_meaning_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0430/6570/4602/files/definition_of_aerobic_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8077/files/sepamafor.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/73081535464.pdf
    • https://cdn.shopify.com/s/files/1/0452/6401/1421/files/area_and_perimeter_of_polygons_worksheet.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000b834.bin
d8430723cb0928e789d19fac7fe7aee91a0a94934a0139d27276bf540bf80c90		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB834 26196 bytes
font_00_sfnt_off00006e9b.bin
b740fb5772f30033a20b64cac589e5f3d4272b57f5e72ea652a39b6fd94a8056		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9B 1644 bytes
font_01_sfnt_off000076d1.bin
6a63b2e6ccca553381eca8f44cd9cd3484443efbd652959cb4aec55be77fcc6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D1 5280 bytes
font_02_sfnt_off000088ac.bin
baebc9868b6c4b0d2301979112a00b96819493b56dfee445b1fcf703d36980f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88AC 15176 bytes
font_04_sfnt_off0000e52c.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 4324 bytes

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