Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb305ff6d770505…

MALICIOUS

PDF

41.8 KB Created: 2020-08-24 13:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25f0ab5e0b1411182e32ff117ee389ff SHA-1: 336895038c94eb7d47dc0efcc8e02937a6a29f9b SHA-256: 3cb305ff6d770505822af98b2949f8640f7f6d81168a0d6b7c55150286d72dce
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.cc. The document body contains garbled text but also includes the same redirector URL and several Shopify URLs, suggesting a lure or redirection mechanism. No scripts were extracted from this sample.

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.cc/pify?keyword=guided+readers+and+writers+first+20+days
    • http://files.kelseyleon.com/uploads/1/3/1/4/131453081/c308f67eedf4a.pdf
    • http://sabawit.venusdirections.com/uploads/1/3/1/4/131408027/nobafelogizesa-xemaviwivojina-rorediz-nixuf.pdf
    • http://novuza.centralbluemountainsgardenclub.com.au/uploads/1/3/1/4/131438464/5094047.pdf
    • http://files.lafayetteart.org/uploads/1/3/0/8/130814535/kodamep.pdf
    • https://cdn.shopify.com/s/files/1/0429/1438/1980/files/menotifikupojakogefuburov.pdf
    • https://cdn.shopify.com/s/files/1/0434/0236/3045/files/renepugapedobadusidavol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/vefifitumikovav.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/gezomif.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/kaggle_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6917/files/kimefapifejujatejawamola.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5591/files/fetch_local_json_file.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7967/files/hacker_pocket_style_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7686/1606/files/nopatu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/pamewus.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/68040972846.pdf
    • https://cdn.shopify.com/s/files/1/0434/4817/2710/files/jujodexitode.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/66659684089.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_off00006581.bin
fc8eb11d170ebfb7b5b0e0c4240f9afa00bf16974e875a8c66be26391edb5bb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6581 5368 bytes
font_01_sfnt_off000077ea.bin
b2c8f89c00b40ddb3957a9fcf91585d3c92bece0757ee4b4c853eab8cfebb756		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77EA 10104 bytes

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