Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bcda7ee9751675…

MALICIOUS

PDF

43.0 KB Created: 2020-08-04 05:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a121f5d10edde9c29e730de7c2ceacfb SHA-1: 83630fea8d0d5ae5e59a0611672613c7ff12c486 SHA-256: 84bcda7ee9751675f77ebd9441e15dd7bcf823a9d55766479ad4f7baa8f1a108
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'mainstays 3 shelf bookcase instructions pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/pify?keyword=mainstays+3+shelf+bookcase+instructions+pdf
    • http://files.jlgpublishing.co.uk/uploads/1/3/1/3/131380971/18be3427427f.pdf
    • http://files.verifiedpress.org/uploads/1/3/1/1/131163599/580d897.pdf
    • http://files.geo-mac.com/uploads/1/3/1/6/131637190/guvax-pufukotidiw-zamaxeput-lagunukaduzamez.pdf
    • http://files.shedfield.com/uploads/1/3/0/8/130814115/616796.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/61421265262.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/96667738711.pdf
    • https://cdn.shopify.com/s/files/1/0432/6532/7262/files/2880601815.pdf
    • https://cdn.shopify.com/s/files/1/0428/7610/8956/files/24008055484.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/xajogikovadar.pdf
    • https://cdn.shopify.com/s/files/1/0428/6326/3910/files/molew.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/24343820569.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/forum._cheatengine._org_viewtopic._php_t_585234.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/blank_html5_page.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_off00005640.bin
a54fe06ca9e5aab26f556892c91e262524d66580d4dbc7277d1822eec148e5b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5640 5600 bytes
font_01_sfnt_off00006939.bin
f64405c0861afb922d874791d0c3ba873699c76e54889a56a2b1ada426c713b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6939 11144 bytes
font_02_sfnt_off00008f2a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2A 4324 bytes

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