Malicious PDF — malware analysis report

Static analysis result for SHA-256 925699433a3d534c…

MALICIOUS

PDF

43.8 KB Created: 2020-08-31 11:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5423602bc20125f43fae988c4b16927 SHA-1: ae024ca9ee87bbebd512554990ac4fffd2474277 SHA-256: 925699433a3d534c8db579364541b1b58da940f98fd6e328b095fce1a9832484
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links directs to a known malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated and unreadable.

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=ba%25C4%259F%25C4%25B1ml%25C4%25B1+ba%25C4%259F%25C4%25B1ms%25C4%25B1z+de%25C4%259Fi%25C5%259Fken+%25C3%25B6rnek
    • https://cdn.shopify.com/s/files/1/0430/8520/1561/files/35857081388.pdf
    • https://cdn.shopify.com/s/files/1/0428/5834/8700/files/market_leader_advanced_business_english_course_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/9753/8203/files/3266108338.pdf
    • https://static.usrfiles.com/ugd/409ca8_b411b5db8ce841c09f9fc18c2fc3fed2.pdf
    • https://static.usrfiles.com/ugd/e73fea_625c95c779de498c902ee0a197cae969.pdf
    • https://static.usrfiles.com/ugd/0d2908_1b8fdac3986241138695832b8a88e71c.pdf
    • https://cdn.shopify.com/s/files/1/0432/9557/2126/files/27999257561.pdf
    • https://cdn.shopify.com/s/files/1/0435/9123/7791/files/artificial_intelligence_in_military_applications.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/99021646547.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7900/files/40205724408.pdf
    • https://cdn.shopify.com/s/files/1/0438/6593/1936/files/interpersonal_communication_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/vovajigimumakiveg.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/tiziserudenumoduzake.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_off00005bde.bin
e76b0cd9ec8a5f48ae5dfbbe97ca50578f99c3befec59274fd77adf8303893c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDE 5520 bytes
font_01_sfnt_off00006e08.bin
8a0909ff330b675d082d78489ae0051c4aebe7ed151e9b66bc5c92af43aee7b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E08 11772 bytes
font_02_sfnt_off00009238.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9238 4324 bytes