Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacff2711401c482…

MALICIOUS

PDF

45.8 KB Created: 2020-08-31 18:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca50dee77af80883150c7540fd19b8f2 SHA-1: e3775a01aecb2baa77e294544ac9031702f4f67f SHA-256: bacff2711401c482f8fb6e5fa32b4e2acf0456624f7b449b4bdbb571d29ef131
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a PDF link farm. One of the primary URLs, 'https://ttraff.link/pify?keyword=3d+1080p+wallpaper+free', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links pointing to 'static.usrfiles.com', suggesting a coordinated effort to distribute malicious content or engage in SEO poisoning. The ML classifier also 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.link/pify?keyword=3d+1080p+wallpaper+free
    • https://static.usrfiles.com/ugd/756799_28f42d5c8d61497aa0cf804d8a5d8fd2.pdf
    • https://static.usrfiles.com/ugd/b8c837_577d03c2bc6a44589703ca04f8528cd5.pdf
    • https://static.usrfiles.com/ugd/4117a9_3bf08e5101b24a1893ae023c45e10a7f.pdf
    • https://cdn.shopify.com/s/files/1/0433/3830/1590/files/xejebajabarelebeti.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40948382406.pdf
    • https://cdn.shopify.com/s/files/1/0440/5841/1158/files/texivokejewuxibisowapujew.pdf
    • https://static.usrfiles.com/ugd/c836c3_89e3688007a144e289ec1010f9687ed3.pdf
    • https://static.usrfiles.com/ugd/0d2908_e9c0a091721b4851becb3f2cf18cf31b.pdf
    • https://static.usrfiles.com/ugd/fe83c3_20a96b9015a24e89a4f7e86834997dbe.pdf
    • https://static.usrfiles.com/ugd/b8c837_64e22d33b8e24ab081d2ae50c4621a43.pdf
    • https://static.usrfiles.com/ugd/8cbfce_799494100fe84c54a1b743611a7ba762.pdf
    • https://static.usrfiles.com/ugd/b8c837_73a80f57492649dd8f59a51421ebdead.pdf
    • https://static.usrfiles.com/ugd/191a6d_038617c7328743309d7b3346bc23a125.pdf
    • https://static.usrfiles.com/ugd/4cf28d_00f45f2ac8d94436a03de11d17c60f55.pdf
    • https://static.usrfiles.com/ugd/36f25b_09d85a0986974167995ecb3de6e0b727.pdf
    • https://static.usrfiles.com/ugd/e2c250_93ab2da9c6bb4d5f8c6b82c0541b4385.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_off000067ec.bin
9a959111de838ee5b4fb03097597683251f8c0fea0784945e503b438e4fea20c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67EC 4852 bytes
font_01_sfnt_off0000787e.bin
0f5bbe7fda19df835c731fe445c35280ce5cec136ca2f6735b5979ef925ba68c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787E 10340 bytes
font_02_sfnt_off00009bdb.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BDB 4324 bytes

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