Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0034bbcb972a38…

MALICIOUS

PDF

41.0 KB Created: 2020-08-29 19:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfded12227a5e606d5a353c9da7a0531 SHA-1: c4442437b7c616891da0eb3883573efc0f25bf0d SHA-256: 1c0034bbcb972a38509c7e1863ec7c0a7a8431aad9eecbf48e93324e7986b2af
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text fragments that, when combined with the URL, suggest a lure related to 'Android notification auto clear'. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering via a malicious link embedded within the PDF.

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=android+notification+auto+clear
    • https://static.usrfiles.com/ugd/05900a_ddca5c1eca6f4103bc53b702e527fe35.pdf
    • https://static.usrfiles.com/ugd/3aca14_4b78d94a74264959aa068c6bebde4bb9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7bc3773947c4fe99aed41d6f2988ff0.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7a977799c7c42a5b387ae7b60020c90.pdf
    • https://static.usrfiles.com/ugd/8de238_bd8a5aa6ef95409fbe2a456e54306623.pdf
    • https://static.usrfiles.com/ugd/c1de29_898556ec09d442c8adbd2dce285967c6.pdf
    • https://cdn.shopify.com/s/files/1/0433/8391/4654/files/76463136952.pdf
    • https://cdn.shopify.com/s/files/1/0431/1878/8774/files/books_on_apostolic_ministry.pdf
    • https://static.usrfiles.com/ugd/b8c837_b92fa0b6174c46968c8cddc0ad240f12.pdf
    • https://static.usrfiles.com/ugd/b8c837_de72f55ec117407cbe967f743b2b15d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_de82ef8dd8774e5a86d629f3711181a5.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_off0000641c.bin
979887e6e6adc61f4923926cf229b0d2faea1f80abe99a35dac5b85d2e29dd16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x641C 4828 bytes
font_01_sfnt_off0000748b.bin
60c8a97ace3dabaae41cfe572fc246add7275c27c34e3bafada47e2cc67e693c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x748B 10208 bytes

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