Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a769dfdd8a954d…

MALICIOUS

PDF

56.2 KB Created: 2020-08-25 07:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3e90915129c58ae9d469b5f9ff42912 SHA-1: 441c3cf6e9fca68f8232d8844737e79f7702262d SHA-256: 66a769dfdd8a954df076e7c2a397b25762bc1d3059f4ed07aad6be0b775b1b40
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate malicious intent, likely to lead users to further malicious content or phishing sites. The ML classifier also flagged this PDF with high confidence.

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=bc+highway+map+pdf
    • http://files.perfeccionatupiel.com/uploads/1/3/1/4/131438477/tijadu.pdf
    • http://files.mandelnewman.com/uploads/1/3/1/3/131380107/5866891.pdf
    • http://files.developingdifferencemakers.com/uploads/1/3/0/7/130738876/610e932a7a.pdf
    • http://files.lachouettealunettes.com/uploads/1/3/0/7/130740196/vazuloliw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5181/7883/files/10033986127.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/latusafodamivejopi.pdf
    • https://cdn.shopify.com/s/files/1/0457/4121/1804/files/36545347993.pdf
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/89662806758.pdf
    • https://cdn.shopify.com/s/files/1/0461/8918/3129/files/positioning_statement_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/4135/6967/files/alfonsina_y_el_mar_guitar_duo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9148/5091/files/prince_of_persia_apk_obb_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/1955/8299/files/ipl_2020_schedule_full.pdf
    • https://cdn.shopify.com/s/files/1/0436/0614/7229/files/vefagisaxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/brabu_part_3_result_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/4901/5713/files/dugilinamolo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/51119016833.pdf
    • https://cdn.shopify.com/s/files/1/0437/9767/6192/files/hallelujah_sheet_music_clarinet_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/freightliner_cascadia_diagnostic_codes.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_off00009106.bin
cf51323d1bc5c5ee774d05d43a884511c3868d284573b21386b27fe74c9aa2c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9106 5508 bytes
font_01_sfnt_off0000a3ba.bin
c5d7ee432e55014b4eb5a6e13e68a500ec7471f21de90e85a9ea8c0f163cf193		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3BA 15452 bytes

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