Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32c8e9c99698990…

MALICIOUS

PDF

44.1 KB Created: 2020-08-29 02:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eec055f2ef3b380f1f7f05ed24f31f9a SHA-1: e3be991c9063de76c434238c6bafb03d38d74fd3 SHA-256: d32c8e9c996989904d55231ad5cff86f232fc0c851553b06463a165ad781decf
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 external links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of a link farm and a malicious redirector suggests an attempt to lure users to potentially harmful content or manipulate search engine results.

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.ru/wix?keyword=understanding+worship+pdf
    • https://static.usrfiles.com/ugd/b8c837_cd9bfd38d42e48b6bb8d100e0355912b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7d1e08b2b22426390614c8d885f4e7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9a9fea88f0240649fe5c4050693dea6.pdf
    • https://static.usrfiles.com/ugd/b8c837_f08824529f9b4738bcc0c7db2681c5c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_04b691418b70453aa3f836a0939145b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_3eb302010e414e41a3cf82b8467ae960.pdf
    • https://static.usrfiles.com/ugd/b8c837_f86210dab46140d2aa205a30258b3991.pdf
    • https://static.usrfiles.com/ugd/b8c837_62ead4b5d7db4e8381977a53c9133e96.pdf
    • https://static.usrfiles.com/ugd/b8c837_204a331194f440838d8c927d2a2c01f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d422ec1068354474a274f0a8a3d3554d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b2b4741eb5f46f79aa0b76dd6a13968.pdf
    • https://static.usrfiles.com/ugd/b8c837_587835a246bb40b29448abf5d98af683.pdf
    • https://static.usrfiles.com/ugd/b8c837_6bce75eab4a74046a3de81a9a599826a.pdf
    • https://cdn.shopify.com/s/files/1/0429/6802/3194/files/99488856044.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/73465591736.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_off00006cba.bin
7feeb4fef23540196e05e2c1eb8f01273a483b840af1185314c8df19fce2410a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBA 5352 bytes
font_01_sfnt_off00007efa.bin
04c964a2449032a1a8f7a78b6cdfe4ce0b3bcd8f98534f4d88be0804449e8c7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFA 10692 bytes