Malicious PDF — malware analysis report

Static analysis result for SHA-256 4043e892f979694b…

MALICIOUS

PDF

51.3 KB Created: 2020-08-01 20:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d97846e2dc0dfa043c465d3d2b16fa8e SHA-1: 6e9ea1e15a845078e1638ac81b6beb0edeaa2974 SHA-256: 4043e892f979694bd0c90af97fd824e50bd782699a3e3e43124cba19b4df7aef
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results or redirect users. The presence of numerous embedded links, including a large number of external PDF links hosted on platforms like Shopify, strongly suggests a malicious intent related to SEO manipulation or content redirection.

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/pify?keyword=iran+sex+pic
    • http://files.gcgoldenmemorial.com/uploads/1/3/1/0/131070872/mogusotiraz-gewufesalox.pdf
    • http://files.rolweshomes.com/uploads/1/3/2/6/132682790/libebukarazidap.pdf
    • http://files.christianlisker.com/uploads/1/3/2/6/132681985/4781431.pdf
    • http://files.justuscox.com/uploads/1/3/0/8/130814492/2613722.pdf
    • https://cdn.shopify.com/s/files/1/0433/3204/2920/files/dasixux.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/lilunaguw.pdf
    • https://cdn.shopify.com/s/files/1/0439/0669/5320/files/78400737792.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/rojiretodixowabusiwok.pdf
    • https://cdn.shopify.com/s/files/1/0437/7418/1534/files/96111304563.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4266/files/59659087227.pdf
    • https://cdn.shopify.com/s/files/1/0429/3600/8871/files/27849051672.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99324429390.pdf
    • https://cdn.shopify.com/s/files/1/0428/9101/8396/files/buxamododatesi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7160/2849/files/suzutufebonisazejitejam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/rusodobawetibulod.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
stream_005_off00009430.bin
9294573ea7d7a8259f4f76016456baef3c7b38c6c284cccb1d170a8cc0555c77		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9430 25640 bytes
font_00_sfnt_off00005fa8.bin
e94cfdbcdd9586b3fa776f53f42c97a35ee0793e3c3b8bc92795cd28949017e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA8 4900 bytes
font_01_sfnt_off00007067.bin
3284383beaa9a687e4c2e46334f66e2e737a71bd670aaa16901f49075d3b3075		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7067 10452 bytes

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