Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dda3f4346e8855…

MALICIOUS

PDF

47.6 KB Created: 2020-08-14 19:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37cd68c96a69159a816a99a5ffb1e1a6 SHA-1: bc52ff8ea3d92d2ac33c31537a0aabfa3486b42e SHA-256: b9dda3f4346e88552c3d0edb1f5f6dbe5f1b5e08cae431fa6e7448f82e946ada
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also includes the URL 'https://ttraff.ru/pify?keyword=wordpress+themes+free++responsive+for+news', which is flagged as a malicious redirector. The presence of numerous links, including those hosted on Shopify, suggests a link farm or SEO manipulation tactic, potentially leading to further 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.ru/pify?keyword=wordpress+themes+free++responsive+for+news
    • http://zaxadufad.heerlijkharen.nl/uploads/1/3/0/7/130739415/914160.pdf
    • http://faleve.faithworksholden.com/uploads/1/3/0/7/130775734/jovotenafekarowadofe.pdf
    • http://files.theabidingpractice.com/uploads/1/3/1/4/131452824/3e4af9b22f.pdf
    • http://viwaker.jbsedweb.com/uploads/1/3/2/6/132695278/buruvu.pdf
    • http://mebap.thequillgallery.com/uploads/1/3/1/4/131438464/ruxopugizixi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3827/6760/files/momepejogifa.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/agitator_mixer.pdf
    • https://cdn.shopify.com/s/files/1/0438/6825/8469/files/pimunafupabetax.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/wiponupimetekizere.pdf
    • https://cdn.shopify.com/s/files/1/0453/9875/3448/files/obc_application_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/56110201731.pdf
    • https://cdn.shopify.com/s/files/1/0432/3177/2835/files/xefuduj.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/46069461329.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/givorezewitawomazuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/dunufifoza.pdf
    • https://cdn.shopify.com/s/files/1/0432/1778/0896/files/bosedobadotubojixano.pdf
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/nimexobevubagululitofix.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_off00007b9c.bin
68815a88eddc2226e5b56c350cc9d3653ad18118fe573cfc69e14902e680ef24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9C 5204 bytes
font_01_sfnt_off00008d4d.bin
2b223330df4fccc75eaa01b6d0a574c73321611a9970673060e7c485f75b66b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4D 10424 bytes

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