Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77025db5b0e2ba5…

MALICIOUS

PDF

35.6 KB Created: 2020-08-20 04:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e3f491789916c21fe7fff06e4d8774f SHA-1: d67e4390e83bc2e123c20e07d1781a634fca1b4f SHA-256: a77025db5b0e2ba596c858b03e4ae59cfbe1a1c233a1dcb967d7c76291b1ca2d
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to a malicious URL, disguised as a whetstone sharpening guide. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack. No scripts were extracted from this sample.

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.com/pify?keyword=whetstone+sharpening+angle+guide
    • http://files.finsunited.co.nz/uploads/1/3/2/6/132682134/6577730.pdf
    • http://pibutib.savingendangeredspecies.org/uploads/1/3/0/7/130775405/pudovep-nupafunubu-kovulikun-nikori.pdf
    • https://cdn.shopify.com/s/files/1/0436/4995/8046/files/58687481020.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/fupavegipoxajukagom.pdf
    • https://cdn.shopify.com/s/files/1/0437/9839/7085/files/83734958320.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/16499820968.pdf
    • https://cdn.shopify.com/s/files/1/0433/6500/7509/files/7822192519.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/4107805856.pdf
    • https://cdn.shopify.com/s/files/1/0433/7595/2030/files/amoniaco_usos.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8864/files/78981766858.pdf
    • https://cdn.shopify.com/s/files/1/0429/9220/5978/files/45122742556.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4056/files/pre_algebra_rules.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_off00004e30.bin
16f376679bb13eeb364198a4141b4a145651a48d33c51e8252b7872c476f9d98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E30 5236 bytes
font_01_sfnt_off00005ffc.bin
0b27d35c103cdadcbd5e8fcd3b980413c43213ab45e513c2fba94aa76a829833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFC 9908 bytes

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