Malicious PDF — malware analysis report

Static analysis result for SHA-256 f644b4e6431c737d…

MALICIOUS

PDF

64.8 KB Created: 2020-08-31 08:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32467f88f55f73ab812736c4a956b6df SHA-1: 47d6f53c209b48da4eb1dc3f1db8d2db8068f7fb SHA-256: f644b4e6431c737da6ba9bdd1f13ac5b33a272621075dcf63d60a384b7b668a2
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector's target. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing lure.

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=ejercicios+de+unidades+de+longitud+5+primaria
    • https://cdn.shopify.com/s/files/1/0430/3595/1257/files/pudonebiseviwegi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/83278480927.pdf
    • https://cdn.shopify.com/s/files/1/0430/3273/9989/files/agrarian_reform_act_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0432/6896/4505/files/mosoxiguv.pdf
    • https://static.usrfiles.com/ugd/b8c837_4456d4e8d39a47e0b54fa0663237473a.pdf
    • https://static.usrfiles.com/ugd/270e53_91e999185d33411691ef6945bb1a94f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d22341427f8f4d27855f576d3dc0180f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7462a882ca2b464dbee0ae7e5f646a61.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb182faf500d43258938161b721e2c6e.pdf
    • https://static.usrfiles.com/ugd/6d59ab_3b8f51f6d09b426ead787f392c3887e3.pdf
    • https://static.usrfiles.com/ugd/314c35_9b43c141b7bf4789a7a686eb33872210.pdf
    • https://static.usrfiles.com/ugd/314c35_d7018a29af4247b0818fcb5df6599ce0.pdf
    • https://static.usrfiles.com/ugd/5b9365_a442c49236cb42c3a640ae1adc4a0f63.pdf
    • https://static.usrfiles.com/ugd/8b97dd_993b634470c14facbbb9e8366482f930.pdf
    • https://static.usrfiles.com/ugd/df4650_afa12bb912ac4f8caa3e9d369aedfc55.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/
    • https://static.usrfiles.com/ugd/8b97dd_993b634470c14facb

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8ea.bin
b51ce015be061168cac230dd284d8929611ff75dc8dcb865ba71f5453e54dd39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8EA 5432 bytes
font_01_sfnt_off0000bb4f.bin
e5c46225f999dfea1949eb887260dc22ab003b4f21634d07ad7c3863edb0988e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4F 13892 bytes
font_02_sfnt_off0000e60f.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 4324 bytes

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