Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f92f62562c1769…

MALICIOUS

PDF

42.4 KB Created: 2020-08-28 22:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df1507b4a2c295525f9da8b387c00a0b SHA-1: efa575741749560889864ef04f1ad136f23e7b20 SHA-256: b3f92f62562c1769b973c53f1bfd9d5fa57552d0957b04e73b01d8d3a41563e9
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.cc/wix?keyword=imaginarium+mountain+rock+train+table+instructions+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to product instructions. The presence of numerous other links to static.usrfiles.com suggests a link farm or content distribution network used to host the malicious content or related lures. The ML classifier strongly indicates maliciousness.

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.cc/wix?keyword=imaginarium+mountain+rock+train+table+instructions+pdf
    • https://static.usrfiles.com/ugd/b8c837_29124ebfb1394f6890e91d97662791a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_6750a3ee64b34a2597d692cbba752b09.pdf
    • https://static.usrfiles.com/ugd/b8c837_40427c1de91b472eb12c545b3c415cf4.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c4e3d1d74f947e1ae4d67666191a89f.pdf
    • https://static.usrfiles.com/ugd/b8c837_559195fe310343769ccc0ecd72120be9.pdf
    • https://static.usrfiles.com/ugd/b8c837_3260366124be4704b453ddd5b010acfb.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c000e4c12a145e98246d6fbf9937f2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_870e0e68e57640e58ff529effbee9e36.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a168aa21abb4672b0bcdeffe4bc379d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1cf448b6cbc46a68b31134152d4f845.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0810/files/comptia_network_study_guide_fourth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/8669/1998/files/33106860042.pdf
    • https://cdn.shopify.com/s/files/1/0429/0209/3987/files/bhagat_singh_college_admission_form_2017.pdf
    • https://cdn.shopify.com/s/files/1/0461/8479/2217/files/acrylic_sheet_cutting_service_near_me.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_off000057d7.bin
d2eff843ce09ee0b5c189958b5e4befc256e5b86edb16e84fbb69d6bd73ac713		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57D7 5496 bytes
font_01_sfnt_off00006a5e.bin
e322c904c41e2cde74d8238c1f04fda24c8eb172df02200a790ff8503c278641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5E 10492 bytes
font_02_sfnt_off00008e3e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3E 4324 bytes

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