Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e62dd21e906f12d…

MALICIOUS

PDF

44.7 KB Created: 2020-08-08 04:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c05d465168a83dd4a471a115d565dee7 SHA-1: 5e181b5b0f0e01dc59f500b1fb70241fce9bdc8e SHA-256: 9e62dd21e906f12d9e7d06805d9823025a9b56c4b5eda33242515224aa22e0d6
150 Risk Score

Malware Insights

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

The PDF contains a link farm with 19 external PDF links, many of which point to Shopify domains, but one critical link redirects to a known malicious infrastructure. The document body, though heavily obfuscated, contains the text 'Absolute value worksheet grade 7 pdf' and the malicious URL 'https://ttraff.cc/pify?keyword=absolute+value+worksheet+grade+7+pdf', suggesting a lure to a malicious site disguised as educational content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=absolute+value+worksheet+grade+7+pdf
    • http://files.ohbot.co.uk/uploads/1/3/0/9/130969826/7958267.pdf
    • http://files.tendylifehockey.com/uploads/1/3/1/3/131384777/0a7bea2a16864.pdf
    • http://files.oldportcandyco.com/uploads/1/3/0/8/130815381/3c686a458fa65.pdf
    • http://files.natur-ally.org/uploads/1/3/1/6/131636914/47cb086faf29295.pdf
    • http://files.championsgymnasticscenter.net/uploads/1/3/1/4/131454670/7c5c9d6.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/tejejibezuwamaremoje.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/nelimavomorixad.pdf
    • https://cdn.shopify.com/s/files/1/0443/1357/5580/files/mumbai_metro_rail_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/1943/6185/files/tagalog_to_english_translation.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7317/files/92782412049.pdf
    • https://cdn.shopify.com/s/files/1/0431/6961/1932/files/69881053952.pdf
    • https://cdn.shopify.com/s/files/1/0439/8841/8718/files/46201137678.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/61398908067.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8210/files/sex_pistols_my_way.pdf
    • https://cdn.shopify.com/s/files/1/0435/5719/1843/files/repiwexuxuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6604/files/tafomuk.pdf
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/22629641905.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/tenuxagokifagu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5856/1175/files/4th_edition_dungeon_master_s_guide.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_off000061d3.bin
7346d9e8e5806f45ccca27129f3a82f4f3352bdf072208ecb912d4701a7d5c70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D3 5456 bytes
font_01_sfnt_off00007492.bin
b0f24999f5f06689e399d1bd0bf91b3561c0f9b21540daea956cc665f29f3e67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7492 10140 bytes
font_02_sfnt_off0000973e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x973E 4324 bytes

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