Malicious PDF — malware analysis report

Static analysis result for SHA-256 123f651c043fae8a…

MALICIOUS

PDF

55.8 KB Created: 2020-07-19 04:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef3438becf96f840ce9fc56296701a9f SHA-1: df036b983e5fea15f838ab9e008cf13668f5f281 SHA-256: 123f651c043fae8a941ca624d71895016e280e592adf7502ba4f7041ccc17096
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or spamming operation. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic point to a phishing or redirection attack.

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/wb?keyword=web%20application%20security%20for%20dummies%20pdf
    • http://files.excelpowerusercourse.com/uploads/1/3/1/8/131856358/7518440.pdf
    • http://files.gilliantorckler.com/uploads/1/3/0/8/130874629/gomenevidi-kinepowa-xasokipa-xupuzateseroji.pdf
    • http://files.janettesdesignstudios.com/uploads/1/3/0/8/130874025/gokijibujov.pdf
    • http://files.umicad.com/uploads/1/3/1/6/131637546/dujasesetoreda.pdf
    • http://files.buiebeadz.com/uploads/1/3/0/8/130874647/1717715.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://xajezeduza.files.wordpress.com/2020/07/porirejewunuti.pdf
    • https://duwarezozaju.files.wordpress.com/2020/07/mofosuvu.pdf
    • https://busupigox846814838.files.wordpress.com/2020/07/51211007442.pdf
    • https://nudokux.files.wordpress.com/2020/07/89097411384.pdf
    • https://detofoxi222376319.files.wordpress.com/2020/07/62217523278.pdf
    • https://navolag.files.wordpress.com/2020/07/95501405387.pdf
    • https://fogojifoxuni.files.wordpress.com/2020/06/41679912256.pdf
    • https://mawumobu.files.wordpress.com/2020/06/lusepa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/33792308134.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/lifavavagisodefonulovexab.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/bujomugedixowarulavo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/59150839753.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/66189425610.pdf
    • https://cdn.shopify.com/s/files/1/0431/6849/7823/files/23098731206.pdf
    • https://cdn.shopify.com/s/files/1/0432/1450/4093/files/dinir.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_off00009c28.bin
f7189b5d7224b962e4842f02ba7468d0b4a5ecdf76e83b555705f6dea9ba5743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C28 5440 bytes
font_01_sfnt_off0000ae8e.bin
e3aa4223031df3aa31f8c367a3e515f3f73693d75d009a85f70362875ff31da8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8E 10240 bytes

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