Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40fd9a2c55df4ce…

MALICIOUS

PDF

33.8 KB Created: 2020-09-22 13:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0108d1e9633c8adc178de74346f49096 SHA-1: c8a1ca3a9f3a7228a27e8f25f6a474959c4e76a9 SHA-256: b40fd9a2c55df4ce8654784a162fcda49f61397f3ec7c56acd5d844079fd136e
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links designed to lead users to external websites, a technique often used for SEO poisoning or phishing. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link pointing to a known malicious redirector, and PDF_SEO_LINK_FARM indicates a mass of external links. The document body, though heavily obfuscated, contains the initial lure URL and references to a manual, suggesting a deceptive pretext for the links.

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.link/wix?keyword=arb+elements+fridge+freezer+manual
    • http://files.enosexecutiveteam.com/uploads/1/3/1/4/131436978/6364980.pdf
    • http://files.wilesmenschla.com/uploads/1/3/1/0/131070452/a1b909f656.pdf
    • http://files.homesonregina.com/uploads/1/3/1/3/131398507/rofutusawebofe.pdf
    • http://raluluwoz.nicolakeenonstage.com/uploads/1/3/2/8/132815094/xelowiledetumefive.pdf
    • http://files.ayurvedabarcelona.eu/uploads/1/3/1/4/131437012/luforalawek_sejoromimese_matuzop.pdf
    • https://cdn.shopify.com/s/files/1/0431/5929/0022/files/birixatufugevodotopavisu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6670/4550/files/fractions_into_decimals_and_percents_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/6697/3589/files/10837489013.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/negegaropafawig.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7333/files/gta_san_andreas_cheats_codes_app.pdf
    • https://cdn.shopify.com/s/files/1/0448/1875/9842/files/wojobavexun.pdf
    • https://657e0170-44b8-4410-a510-656d4682c6f0.filesusr.com/ugd/b54ff4_793070977b61449e96f20e62df103911.pdf?index=true
    • https://3e48d273-de91-474f-a51a-0d590c63d963.filesusr.com/ugd/a91264_323335b3b010451a8bbf4c56ee945525.pdf?index=true
    • 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_off000046bd.bin
eac051204a6859281ae4c25f2065e34dfe96f646d88791f2c0fd4d83eb67c249		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46BD 5408 bytes
font_01_sfnt_off0000590c.bin
bd8991ee1902ec79ef2d64f877c8ddf1fe4c767a8402c8213bc15bef4d39517b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x590C 9808 bytes

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