Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc7ab723b518b6a…

MALICIOUS

PDF

50.2 KB Created: 2020-08-09 04:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae920aa2bb59bd6d3534634730ae8e69 SHA-1: 389c6ed881b663486396d2502be10e8d036877e1 SHA-256: 9dc7ab723b518b6ac5c4ad927b284ca4302aabd8ca91c9650fa8650b9bb264eb
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify-hosted PDFs. One of the primary links, https://ttraff.com/pify?keyword=biology+general+knowledge+questions+and+answers+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure for "Biology general knowledge questions and answers pdf". The presence of numerous external links suggests a technique to distribute malicious content or to manipulate search engine results.

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.com/pify?keyword=biology+general+knowledge+questions+and+answers+pdf
    • http://files.australianworkersparty.org/uploads/1/3/0/9/130969923/6164931.pdf
    • http://files.buyandsellwithcascade.com/uploads/1/3/1/3/131383228/fisulikagewe.pdf
    • http://files.vibrantroad.com/uploads/1/3/1/3/131379312/jijuru-susuzasafera-nikatigusivozad-xojoz.pdf
    • http://dafolo.andrewburrell.org/uploads/1/3/1/0/131070356/vabewumow-lotijufetotem-jukizaxep.pdf
    • http://files.gretamarchesi.com/uploads/1/3/1/4/131409693/wixurufon.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9546/files/fixaxozobajazililome.pdf
    • https://cdn.shopify.com/s/files/1/0435/7799/9519/files/dekivutote.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/45170125018.pdf
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/77462270885.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/86921720264.pdf
    • https://cdn.shopify.com/s/files/1/0450/3745/3470/files/computational_complexity_a_conceptual_perspective.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/gimodasi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/dusajajudasi.pdf
    • https://cdn.shopify.com/s/files/1/0439/3625/2072/files/xekofudugotene.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0796/files/40211281108.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/lijuseforinivu.pdf
    • https://cdn.shopify.com/s/files/1/0436/7355/1001/files/i_spit_on_your_grave_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/uninstall_brew_package.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_off00006f8e.bin
fa9390edc0952ca30858c5f1ced702c8bc544a69a8b242b220f232b5506c52cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8E 5644 bytes
font_01_sfnt_off000082ed.bin
aedb4108381e9b6b025b333a0523d5aab5fc4595c097f2f84edada92800f1e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82ED 10476 bytes
font_02_sfnt_off0000a682.bin
aac12dfaa7a4717741474a65b6c01b8995e0b1431045641cdbaccc82c068a749		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA682 5728 bytes

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