Malicious PDF — malware analysis report

Static analysis result for SHA-256 77932ba3b62b930d…

MALICIOUS

PDF

43.0 KB Created: 2020-08-18 14:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c636e4ad64dba1e91d75a5e2d9475c8c SHA-1: a50ecb44ccff2eb5a2ba5fc0acafdabc32f4f7de SHA-256: 77932ba3b62b930d38c6f09ec041ac219309650ed504db831e1f09b999f09add
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm of 17 external PDF links, with the primary redirector URL being https://ttraff.com/pify. This heuristic, combined with the ML classifier flagging the document as malicious, strongly suggests an attempt to redirect users to malicious infrastructure. The document body, though heavily obfuscated, contains the ttraff.com URL, reinforcing the malicious intent.

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.com/pify?keyword=application+format+for+college+professor
    • http://files.glacierbaysportfishing.com/uploads/1/3/1/0/131070291/93164fa08c215c.pdf
    • http://fusoz.coastalbeachestherapy.com/uploads/1/3/1/4/131452890/0a1fe76451ce4.pdf
    • http://files.virtuallysmoothpiano.com/uploads/1/3/1/8/131857920/1833890.pdf
    • http://files.phase3security.com/uploads/1/3/1/4/131409508/kewavimefaxalun.pdf
    • http://files.mandarin4u-sd.com/uploads/1/3/1/6/131636819/jenolubava.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8669/9925/files/mahindra_tractor_575_parts_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0430/8104/0033/files/lusevojevegabevibasawirub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84312174386.pdf
    • https://cdn.shopify.com/s/files/1/0432/4042/3592/files/pulse_width_modulation_principle.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdf
    • https://cdn.shopify.com/s/files/1/0435/5656/9247/files/6870019404.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/1702503143.pdf
    • https://cdn.shopify.com/s/files/1/0435/3975/9259/files/vebodiligogo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/51311909121.pdf
    • https://cdn.shopify.com/s/files/1/0431/0532/1109/files/zefulazasuwawo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0098/7801/files/adobe_photoshop_premiere_elements_13_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0447/5686/1077/files/duvibonewiwefe.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_off00006b1c.bin
3c55cccd36b6095c1ee032aa4db5a32cae876d49a0744afc8a5f54be80c03c67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1C 5324 bytes
font_01_sfnt_off00007d1b.bin
c47992a6e505dc2adcac24b7f09843f8f824a188f4988b888518cf2f760f0257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D1B 9948 bytes

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