Malicious PDF — malware analysis report

Static analysis result for SHA-256 c989bfb128876438…

MALICIOUS

PDF

44.2 KB Created: 2020-08-07 01:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14fb6c2203dcb918b189c17d5a8fcd1d SHA-1: 6a4d392bb4805e33b06172e37469ae3f14e6baf0 SHA-256: c989bfb128876438f7d714aa43608663fb116c72f93c4a1ceb830b3bdb912f46
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding a large number of URLs, many of which are hosted on Shopify. One of these links, 'https://ttraff.com/pify?keyword=mla+citation+style+examples+pdf', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to malicious or SEO-manipulated content through a dense network of links within the document.

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.com/pify?keyword=mla+citation+style+examples+pdf
    • http://zifajuxud.straymongrel.com/uploads/1/3/0/7/130775768/9ac2c4a9fed78.pdf
    • http://files.adentapoland.com/uploads/1/3/0/8/130874582/nilanuw-mivokafagej-vuxazosex.pdf
    • http://files.kinosaurusjakarta.com/uploads/1/3/0/7/130776795/xodatena.pdf
    • http://files.lowercrossfarm.com/uploads/1/3/1/6/131607630/52e5532e0a63ad.pdf
    • http://files.ourfamilyrootsfarm.com/uploads/1/3/1/4/131483009/vipafasuzi-bekulesufajanoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2583/3884/files/tosidij.pdf
    • https://cdn.shopify.com/s/files/1/0430/2526/8889/files/loctite_270_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/1179/2286/files/12829048999.pdf
    • https://cdn.shopify.com/s/files/1/0433/0956/4064/files/indesign_print_double_sided.pdf
    • https://cdn.shopify.com/s/files/1/0432/2109/0471/files/surixifigikix.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/diccionario_biblico_espaol_griego.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1779/files/90484889014.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/sirosasivirizizababob.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5453/files/les_calligrammes.pdf
    • https://cdn.shopify.com/s/files/1/0440/1777/8838/files/gojonizelavoteja.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7248/files/square_root_algorithm.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_off00006c8b.bin
02e604447b7394dd97f8bad97cfe0d4dcf943ac99128ad1d3f53cf3d69a30a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8B 5380 bytes
font_01_sfnt_off00007ee6.bin
a45046cacccf513b3bf3a103bd84fe0c5e9083629724ebe360e832e61de0db07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE6 10956 bytes

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