Malicious PDF — malware analysis report

Static analysis result for SHA-256 844b2df3fcc37c08…

MALICIOUS

PDF

46.0 KB Created: 2020-09-02 14:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad15b9316e3c329eabdd3521fb449750 SHA-1: ed37961fd25b2f234f1d967505dbc25fa1dcd97a SHA-256: 844b2df3fcc37c08773e1e804a14aeb35e6a74f88086ce8f4b375d5fe5113998
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to "hepatic cirrhosis guidelines pdf" and a URL that matches the malicious redirector. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.link/wix?keyword=hepatic+cirrhosis+guidelines+pdf
    • https://static.usrfiles.com/ugd/49be48_66da6397a75c48f1ba14f6c95e8d03cb.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_dcf43c27a8314c7eaadc08c86a06ad95.pdf
    • https://static.usrfiles.com/ugd/2c608b_a7906d02d27247448fcad58430182dbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_3242fbb5d0d34c3583bbbcd71ecc4925.pdf
    • https://static.usrfiles.com/ugd/b8c837_95984a5f735046ce9fcdf2916bf839b3.pdf
    • https://static.usrfiles.com/ugd/0511f5_e76e8c64eafd4433b379c9012943e770.pdf
    • https://static.usrfiles.com/ugd/fe83c3_11d4c308361143c1985acd32a5029f28.pdf
    • https://cdn.shopify.com/s/files/1/0430/3912/9751/files/denomination_of_christianity.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8095/files/55866699993.pdf
    • https://cdn.shopify.com/s/files/1/0429/6412/3814/files/temiwub.pdf
    • https://static.usrfiles.com/ugd/ca300b_65fe02e2521c4683ad2a8e5eab64abf6.pdf
    • https://static.usrfiles.com/ugd/db93e9_906d045a73324fd9b0495cdcd0a45cac.pdf
    • https://static.usrfiles.com/ugd/906e9f_88c73841fe3b4462ad7661e6e395ef17.pdf
    • https://static.usrfiles.com/ugd/91e123_2cbee5a16c084733af8c455ce880dcff.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_off00006947.bin
1f36875f12506fc323d57e4d1d8d28f3e864730e44cc722824ea26dba138a5ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6947 5260 bytes
font_01_sfnt_off00007b1b.bin
365e7170732e4e18c62e1de54a0dd6c58aa855a546b2f845fb51e50673e4e2d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1B 10240 bytes
font_02_sfnt_off00009d60.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D60 4324 bytes

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