Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffd4e6b905f25e4…

MALICIOUS

PDF

41.4 KB Created: 2020-09-01 21:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 987588a97cad96c2a3586f6e8b987c5a SHA-1: 27d4509bc3fa6c053c168861dfa8535acfcea018 SHA-256: 6ffd4e6b905f25e47223d98447075f38d6687e1d79a896e03c1c6099da12c493
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one identified as a malicious redirector, disguised as a passport application form. The ML classifier strongly indicated maliciousness, and the presence of a redirector suggests an attempt to lead the user to a harmful site. While no scripts were explicitly extracted, the PDF structure itself facilitated the embedding of malicious links.

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.me/wix?keyword=passport+application+form+pdf+format
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8258/7037/files/fairyland_3_activity_book_vk.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/addition_and_subtraction_worksheet_for_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0435/6286/0699/files/28914752694.pdf
    • https://cdn.shopify.com/s/files/1/0447/3477/5445/files/network_administrator_roles_and_responsibilities.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c31558bff1c4664b5282cef82c857d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_12a2c57c7965420c90df64c0087b1f9b.pdf
    • https://static.usrfiles.com/ugd/0df15e_b52d0a65db0c4d7b81b96415a76c4f5e.pdf
    • https://static.usrfiles.com/ugd/b27199_726b08c78ffd40a0ae163d6a5e7edde9.pdf
    • https://static.usrfiles.com/ugd/97634b_2d435209b83e41c390a66451f0831b1b.pdf
    • https://cdn.shopify.com/s/files/1/0430/9601/5002/files/romep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76102764406.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/27432191809.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/37025736518.pdf
    • https://static.usrfiles.com/ugd/3a38e0_3cb94164a2b941dc822a0d1c9e41015e.pdf
    • https://static.usrfiles.com/ugd/374ce0_d2622d37d9c14eb5866db7c73b08aa7a.pdf
    • https://static.usrfiles.com/ugd/18f527_52995f8f0f6e4549b1bf0e655e16c130.pdf
    • https://static.usrfiles.com/ugd/f63f29_51763a5a94fe4d83b3909daaea4b453f.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062f7.bin
8fcb02b8dc901d81608f53722f94c044aa32f5142517d2070d303ff6f347a21a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F7 5300 bytes
font_01_sfnt_off000074e9.bin
cc6014f1a6c0183d6ba6cb50b2c5b45c9360808ed750ca391ab4d1ad418cb40a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E9 10524 bytes

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