Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceff7249e4ecd041…

MALICIOUS

PDF

46.6 KB Created: 2020-08-06 14:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ada7e44d0921609265e0d4718d0b407 SHA-1: 227a81432e37fbcd8e4df392d632650e5d8fb058 SHA-256: ceff7249e4ecd0414a47c469d70bbb8c37a7e7fd5a12cf01fc1d47cc8348e5ce
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a specific redirector URL, indicating a lure to malicious infrastructure. The document body, though partially corrupted, contains text related to a calendar and holidays, likely serving as a pretext to disguise the malicious link. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, including a redirector, supports a malicious intent to lead users to harmful 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.cc/pify?keyword=calendario+2020+con+dias+festivos+oficiales+mexico+pdf
    • http://files.nativitymenlo.org/uploads/1/3/0/8/130874141/zisajivitolakove.pdf
    • http://xifezosaz.deltastream.net/uploads/1/3/1/6/131606227/lefokatobojez.pdf
    • http://files.richardsmithracing.co.uk/uploads/1/3/1/4/131438539/3755670.pdf
    • http://files.alethearoygadbois.com/uploads/1/3/1/4/131452861/159e7ffda24.pdf
    • http://files.e-fitpt.com/uploads/1/3/0/7/130738928/vajiwen.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2454/files/8396680998.pdf
    • https://cdn.shopify.com/s/files/1/0432/3291/9720/files/55586201377.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tobilefoseparavako.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/advanced_excel_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0008/files/creon_10000_bula.pdf
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/acoplar_documentos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mutim.pdf
    • https://cdn.shopify.com/s/files/1/0435/7950/6847/files/modern_abc_chemistry_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4683/8176/files/34093796286.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0957/files/87709341112.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/27986383131.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065be.bin
54c19f9e9fd83ae16a57492e17824d8cef4408ff9c07da3f34aff075f13584cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BE 5512 bytes
font_01_sfnt_off00007869.bin
6556df46acaf62a14687320464a2789397b3460bfdcc7c5bb2113d7b96515a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7869 11312 bytes
font_02_sfnt_off00009d3e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D3E 4324 bytes

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