Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c75c7c56812a47f…

MALICIOUS

PDF

50.8 KB Created: 2020-08-19 15:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0aaa820a5458429bd0d4f77dd54ca48 SHA-1: 846c4919428904253ded852be89e81862a85f326 SHA-256: 5c75c7c56812a47ffa85436c5b71799cce090180deb1147daa2f2239c15fced3
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as nutrition information, which leads to a link farm of 22 other PDF files. The primary malicious URL identified is https://ttraff.ru/pify?keyword=curly+kale+nutrition+information. The ML classifier strongly flagged this PDF as malicious, and heuristic rules indicate it's a redirector and part of a link farm.

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=curly+kale+nutrition+information
    • http://files.ryleyskelton.com/uploads/1/3/0/8/130873895/2993677.pdf
    • http://files.dreyfus-emerson.com/uploads/1/3/1/4/131438604/dabosimeziga.pdf
    • http://files.manageyourpain.co.uk/uploads/1/3/1/4/131407887/196a252933.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5473/5264/files/saudi_arabia_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/3227/9190/files/21258548147.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/ammonia_combustion.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/11004057389.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2460/files/72258796281.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4642/files/4592213177.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0935/files/werewolves_game.pdf
    • https://cdn.shopify.com/s/files/1/0429/5432/6179/files/59241766233.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b99.bin
adc9975502b5708b81ded9c09b53cd3f42f3bec7c0747468d1951ccc1c991643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B99 4808 bytes
font_01_sfnt_off00009be8.bin
df892b505c23efcf7c52af73012ec83fac2cee21b2d30e81255c6c3d9a4fc05f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE8 10092 bytes

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