Malicious PDF — malware analysis report

Static analysis result for SHA-256 844424788ab8557c…

MALICIOUS

PDF

44.1 KB Created: 2020-08-21 19:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82c3786fd24c423a9556d1530a29ca68 SHA-1: bf8b3d860d11fd281cacb1013aa12c62565e775d SHA-256: 844424788ab8557cc883b577d02d9b67fb830c2d6fdd8408924235856beee621
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a social-engineering tactic, presenting a lure to install a browser extension or update to view content. It contains a mass of external PDF links, with one redirecting to a known malicious infrastructure at 'https://ttraff.cc/pify?keyword=run+android+emulator+mac+os'. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of it being used for credential theft or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=run+android+emulator+mac+os
    • http://files.champion-education.com/uploads/1/3/1/0/131070508/48d91.pdf
    • http://files.lavishsalonhershey.com/uploads/1/3/1/4/131407138/2319484.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6903/7982/files/8686508447.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/16503884374.pdf
    • https://cdn.shopify.com/s/files/1/0436/2433/3472/files/high_school_chemistry_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/6967/7474/files/tsc_te_244_barcode_printer.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/kovilonametibexajefa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2478/5313/files/18702818860.pdf
    • https://cdn.shopify.com/s/files/1/0435/2956/8408/files/75481603255.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/69432315854.pdf
    • https://cdn.shopify.com/s/files/1/0438/3119/7856/files/7757237163.pdf
    • https://cdn.shopify.com/s/files/1/0448/9232/3995/files/pifudu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65233410578.pdf
    • https://cdn.shopify.com/s/files/1/0439/4542/7102/files/xanejokofipuzu.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_off00006f82.bin
b180c58ba5c1bec601959a9ea674cec4f5d1ca1cce888c35b5bd8b6cdb85da58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F82 5092 bytes
font_01_sfnt_off000080b5.bin
01508fa203d4faa2a1a3eb25cde09c2b24230719f27c3e382f2cec7def2b80ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80B5 10196 bytes

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