Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf370238b2c1b03…

MALICIOUS

PDF

59.7 KB Created: 2020-08-09 18:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7e93220bea357f074d1d0419a90e820 SHA-1: 12a0f216b8acaf763b394f0ac308b1729a9b17c9 SHA-256: acf370238b2c1b03a0bba33643242f6bff63ec1e7bc9f7198a52dfd174bc1f33
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=learning+arabic+free+pdf', which is designed to lure users into downloading further malicious content. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDF links, suggesting a link farm strategy to improve search engine visibility for malicious downloads. The ML classifier strongly supports the malicious nature of this PDF.

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=learning+arabic+free+pdf
    • http://files.essenceofgracearomatherapycenter.com/uploads/1/3/1/4/131482991/lisulapem_kamuxu_tobibowibena.pdf
    • http://files.sharonviewcorpcenter.com/uploads/1/3/1/6/131607075/ead296ef6c54be5.pdf
    • http://files.kevincruise.co.uk/uploads/1/3/0/7/130739062/vodadamud_xiwizavekafi.pdf
    • http://files.argonautcoffeeleavenworth.com/uploads/1/3/1/6/131608037/lotijogalusoto-venevezitubaro-loluw-jidurunopiruroz.pdf
    • http://files.thesanctuaryatdennypark.org/uploads/1/3/1/4/131454297/5b195ca0198bf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/75392143199.pdf
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/felebugijubaxekekodizowew.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4330/files/ashrae_standard_15_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/99890213468.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/rekarubif.pdf
    • https://cdn.shopify.com/s/files/1/0433/9043/5495/files/5250141654.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/limodifinu.pdf
    • https://cdn.shopify.com/s/files/1/0438/8516/6760/files/41777207463.pdf
    • https://cdn.shopify.com/s/files/1/0434/2087/6962/files/49905147676.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/71466643380.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/6115855238.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a12e.bin
8a7e331edd4ab37f241cbe42d17a150c9be03062b2d22740618dec20548e9215		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA12E 28172 bytes
font_00_sfnt_off00006e3b.bin
14ff1bd0ea76f04888ef334781ecb36cdaab90d4007bbb942db43c3f9f70e5fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3B 4792 bytes
font_01_sfnt_off00007e86.bin
366f73fa83a711e9b186f83373239533be14f0a654d704f82f7fedcaa8b4ed40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E86 10060 bytes
font_03_sfnt_off0000d35e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 4324 bytes

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