Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf894824c7fcbf9…

MALICIOUS

PDF

40.8 KB Created: 2020-07-08 18:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 224eab5ace1a4e9a6f5e0eaedb3f049d SHA-1: d15812815b209e6cfe4cddaf5d87c40ccaf5c851 SHA-256: bdf894824c7fcbf94bef7953fcbbe5fe665ec5cf34eb45c0146f2f1994d8bdb5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or SEO link farms. The primary lure appears to be related to song chords, with the document body containing obfuscated text and numerous URLs. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of links to harmful infrastructure.

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/wb?keyword=kiss%20from%20a%20rose%20chords%20pdf
    • http://files.valleyliberator.com/uploads/1/3/1/6/131606035/padavosagog.pdf
    • http://files.daventrydogtrainingclub.com/uploads/1/3/0/8/130873973/6745225.pdf
    • http://files.pdxprays.com/uploads/1/3/1/3/131383018/wikixawasagi.pdf
    • http://files.storybookdelivery.com/uploads/1/3/1/4/131437636/1090280.pdf
    • http://files.csnobcs.org/uploads/1/3/1/4/131452806/c9c3257b.pdf
    • http://files.hpcctimex.com/uploads/1/3/0/8/130873830/78174747e.pdf
    • http://files.animalprograms.org/uploads/1/3/0/7/130776403/baxarapabafulu_xepidapivob_sofevenavomox.pdf
    • http://files.maltron.com/uploads/1/3/0/8/130874411/5028717.pdf
    • https://wodugodew84787651.files.wordpress.com/2020/07/zavuwabepanezivoxejuvutaf.pdf
    • https://petejiwekawa563278252.files.wordpress.com/2020/06/36100165347.pdf
    • https://muxibegan.files.wordpress.com/2020/07/81412329400.pdf
    • https://votemeje555592045.files.wordpress.com/2020/07/kufurogegijobudename.pdf
    • https://mupujinivibu.files.wordpress.com/2020/06/fuzutoxumaxib.pdf
    • https://refuxige.files.wordpress.com/2020/06/nadazamaxubela.pdf
    • https://divedemaz.files.wordpress.com/2020/07/96707790894.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jedufejaselikaruratemop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.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_off00005a83.bin
104f2c5196e1d88c88a65a1727641bedaa82d7a30fd2e8a6bb595046d0ef1505		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A83 4932 bytes
font_01_sfnt_off00006b41.bin
5412dcfd29a96209022b4d9947a88e758ea4f29d4192e1f806c7c3e6a94c5736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B41 13956 bytes

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