Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7acb41b0b078a5…

MALICIOUS

PDF

57.8 KB Created: 2020-07-27 03:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62bbfe60428a0acab9dd070369174d00 SHA-1: 60ef7468f562828cde88d1c1e5e7e8969d3e22ae SHA-256: 0a7acb41b0b078a5d55526e2d00adab323a4fe1e787bb00b97f4dff1e27e8385
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to sheet music, likely to trick users into clicking the malicious link. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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=narnia+lullaby+duduk+sheet+music
    • http://files.hopecounselingpetaluma.com/uploads/1/3/2/7/132712080/6622823.pdf
    • http://files.madebyloulou.net/uploads/1/3/1/8/131871891/59bfb6ba928ffb6.pdf
    • http://files.slwellness.info/uploads/1/3/2/7/132712676/182ae7fa2e1.pdf
    • http://files.gilliantorckler.com/uploads/1/3/0/8/130874629/gomenevidi-kinepowa-xasokipa-xupuzateseroji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0200/3609/files/xiwulotadapibosabex.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6589/files/43967034114.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/zaluwonipajuwaninadixewo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6700/6364/files/16211241447.pdf
    • https://cdn.shopify.com/s/files/1/0437/1179/1257/files/tatemuvegoweniz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/38488594540.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/19286137044.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2732/files/63998493097.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/kaneb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7502/7619/files/38784367505.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008aae.bin
097e4199bb2fcf2ad31796bb4a253bb4c848d76094c85fa33a19421c7dde7e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAE 5224 bytes
font_01_sfnt_off00009c45.bin
8b6f097d02a8a09d7377859e3f374008fa0ad67b27dbe204eb450b5ae0cc6970		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C45 10500 bytes
font_02_sfnt_off0000bff0.bin
17785c482e84d23210224fe25dc73bc984a6c0d801edf4148b9da081fd370e0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF0 17728 bytes

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