Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b851b198da5dbf…

MALICIOUS

PDF

43.0 KB Created: 2020-08-30 12:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3359b23be2e2fb45d11e81890264e9bb SHA-1: e821a0a4a4280b09b79786d2b414de4f1a20acde SHA-256: a2b851b198da5dbf8fbe951670e997d6cf85e820312eb49d8d09b2dea30e0282
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, which is a common technique for phishing and malware distribution. The document body, though heavily obfuscated, contains the malicious URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing the user to a malicious URL disguised as a technical document.

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=voltage+and+current+divider+rule+pdf
    • https://static.usrfiles.com/ugd/b8c837_370c8a4cf64e465498425d509cdb1949.pdf
    • https://static.usrfiles.com/ugd/eb4c03_87d65d39f45241fe8dd29253b1d987e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd173868710a4e3bac42fa46603aaa37.pdf
    • https://static.usrfiles.com/ugd/b8c837_247cd209853c4a25a96d0aec6944b7fd.pdf
    • https://static.usrfiles.com/ugd/66c878_4f9bff62dc1a4b24955af5c6b40238b0.pdf
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/juminoxenoxirade.pdf
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/64865824242.pdf
    • https://static.usrfiles.com/ugd/b8c837_623c16f8a7a44d1eaae6d3bf95a21b91.pdf
    • https://static.usrfiles.com/ugd/2486b5_7ea0b5173452424ab65cc8249bfeb295.pdf
    • https://static.usrfiles.com/ugd/b8c837_39f7dbe0cd854a7083df6d2543a5a8f0.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_off00005c90.bin
65175974e0559fabe6dbdeebf69840a4b8b335f3dd0f1af4fdce7550f29a3393		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C90 5052 bytes
font_01_sfnt_off00006dd1.bin
7fa188a7098497d2fcf522093ef206d5d23df049666625b3adaa67fa896b4f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD1 10448 bytes
font_02_sfnt_off0000917c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x917C 4324 bytes

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