Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed1ce3aedc628ef…

MALICIOUS

PDF

52.9 KB Created: 2020-08-06 10:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86fd57ff2356a3d7ce8770328bbb6c24 SHA-1: 1403fc93871e8739e84e61c53d7291e9d6ca77c9 SHA-256: 7ed1ce3aedc628ef94df1ad0585db465134928114d84be4c167f1e6f9a7704b3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to manipulate search engine results. One prominent link, https://ttraff.cc/wb?keyword=how%20to%20speak%20english%20pdf%20in%20marathi, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into downloading malicious content.

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=how%20to%20speak%20english%20pdf%20in%20marathi
    • http://files.rotarysanjuanbautista.com/uploads/1/3/2/6/132683142/gexufojiv-xikubijodolexa-lopid-xikaxiwuzemosum.pdf
    • http://files.batheinbeaufort.com/uploads/1/3/0/7/130775180/sulavirofamuso-vulowavugakus-mewowalazezoje-befuz.pdf
    • http://files.stcatherinesbrynamman.org/uploads/1/3/1/3/131380612/befud-gexire-dagawuwe.pdf
    • http://files.aydenbbq.org/uploads/1/3/2/6/132695519/6329852.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/6542/5570/files/suzexotega.pdf
    • https://cdn.shopify.com/s/files/1/0434/0049/5260/files/60284089627.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/79020603038.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/tajapawawemovoruvufopipe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/41130379778.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/66189526395.pdf
    • https://cdn.shopify.com/s/files/1/0447/4650/6391/files/sims_3_male_cc.pdf
    • https://cdn.shopify.com/s/files/1/0428/7902/5318/files/25217768545.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zupapinited.pdf
    • https://cdn.shopify.com/s/files/1/0430/5649/6791/files/ritifasoxuluwapurakegu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/rowuneguxutobowi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008349.bin
f8e8a6ee3ea7a706ac3841873dc098e301a49e04e7a1e956303ab852a87cc419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8349 5360 bytes
font_01_sfnt_off00009562.bin
21b5b6f6fde7044e0deed0c05e96bec0d4209ffdfe880118897a83238c6908fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9562 10196 bytes
font_02_sfnt_off0000b80e.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB80E 4324 bytes

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