Malicious PDF — malware analysis report

Static analysis result for SHA-256 9874e114c16e4efa…

MALICIOUS

PDF

42.4 KB Created: 2020-08-29 02:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f05fe3d2af6cca6768139e084d85f499 SHA-1: 48fae75b6ecf2d87e454fba40ff6750bb8fa3df6 SHA-256: 9874e114c16e4efafbd36596296219fe66b0212bed45ffc1cfe62838a9a7c7ea
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 one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to manipulate search engine results or distribute spam. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous links points to a content-based lure or spam distribution.

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=caracteristicas+del+bloque+socialista
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/abdul_kalam_speech_to_school_students.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1798/files/komadiralulaxes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6597/4690/files/nuniletizeduboz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/winrar_win_10_full_crack.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4503845d5b84f0ca63de83f4af63989.pdf
    • https://static.usrfiles.com/ugd/b8c837_94c0e0674ccd44a6a766eb1fc515bb00.pdf
    • https://static.usrfiles.com/ugd/b8c837_de4e80c054064e80a40c774c694587f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_ceb5fd6219bb4f58a28047c1bbfcf87a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3f4a0e144e5436d86d7252bc50e2254.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d33dfcc10a846b6a6a1f7ad882374ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_31facdb28ae3470c841cfb5e3d84d451.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e6028287d0e476e80f2e59dde7dd58e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e849912209f04ee8b3916722d17836b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_19e027171820425ba6024ce075f59de4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006896.bin
663f87bde9c5c8c79b51db9d49be9bb9892ad93f202656f142bb61a7f746ff06
pdf-font-stream PDF embedded font (sfnt) at offset 0x6896 5104 bytes
font_01_sfnt_off000079f4.bin
9e8c4ff67ebdedf30a40ef35ce3f7a1c78e5ef2867ab6b864041e3931be10bce
pdf-font-stream PDF embedded font (sfnt) at offset 0x79F4 10428 bytes