Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e307a0067bd60bc…

MALICIOUS

PDF

61.7 KB Created: 2020-08-03 15:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb280da1ae0e4db3377537077c6bb9c7 SHA-1: 1abca65789e88939d6caf46228ea8cbbf20622fb SHA-256: 4e307a0067bd60bcdc1f1020517ab43807d5269bf82ea9598ad0898085edfc25
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a primary link to 'ttraff.ru' identified as a malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Rtf to pdf tool' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect 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.ru/wb?keyword=rtf%20to%20pdf%20tool
    • http://rekibipi.globalweatherclimatecenter.com/uploads/1/3/1/3/131384401/3873907.pdf
    • http://files.cdestinydesigns.com/uploads/1/3/1/3/131379948/7fd0ad71e18491.pdf
    • http://files.realworldanaesthesia.org/uploads/1/3/2/6/132695492/7824762.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/66226077100.pdf
    • https://cdn.shopify.com/s/files/1/0435/2140/9184/files/zolevaloz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/miveguxuxububepevomozit.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/machine_design_an_integrated_approach.pdf
    • https://cdn.shopify.com/s/files/1/0433/6074/7688/files/9536117215.pdf
    • https://cdn.shopify.com/s/files/1/0430/4224/2709/files/velusutuvumatinitifewerut.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/baxofosujafixi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/toniwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78985131446.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/36396573413.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/waxigulazatep.pdf
    • https://cdn.shopify.com/s/files/1/0433/9390/8892/files/coin_sorter_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/96045957896.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_off00007b35.bin
4df4c172ffa2a662a469693a1896466ff4b29b5e39c5ac0c13a891a5fed5534e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B35 18516 bytes
font_01_sfnt_off0000b587.bin
c64318cc2486f98f7b304b23914e0a228daa1cac7ca4f849504ed40fa694c31a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB587 4560 bytes
font_02_sfnt_off0000c52d.bin
89791b67d72c277da78c990381f95ebc3797721b824cfa445b263798ebb6a19c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC52D 10908 bytes

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