Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6460f5dc855061c…

MALICIOUS

PDF

56.1 KB Created: 2020-08-24 14:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bce48810346a3337ed11d83f900d4cc9 SHA-1: 4385719a84535e5e38cb1677a6c2037b70334a4f SHA-256: a6460f5dc855061c185f8cb40c64f6600361b93354910faa90461b059880cb57
150 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=math+is+fun+algebra+worksheets. The document body contains obfuscated text and a reference to the malicious URL, reinforcing the attack pattern. 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.ru/pify?keyword=math+is+fun+algebra+worksheets
    • http://files.bannerplane.com/uploads/1/3/2/7/132712369/dulinarefi-wupafa-renimavuwag.pdf
    • https://cdn.shopify.com/s/files/1/0439/5961/5646/files/beehive_9th_class_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/5583/1445/files/17221686359.pdf
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/amazon_app_store_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0811/files/tawivoxike.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/37565101508.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/jimalawosinumozixo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7211/files/kenmore_elite_oasis_dryer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/87466249345.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/gepifonoxikogoxu.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_off0000941a.bin
98b262794e1f468c950259867e89fb8860977e16dccfb50bf630b0e32f1f8411		 pdf-font-stream PDF embedded font (sfnt) at offset 0x941A 5332 bytes
font_01_sfnt_off0000a64a.bin
6e57d13f436bfe5fd152c741d3afe6e99643b06c210757691c257203474ad588		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA64A 14268 bytes

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