Malicious PDF — malware analysis report

Static analysis result for SHA-256 947e24d48baaf758…

MALICIOUS

PDF

45.1 KB Created: 2020-08-24 14:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c7875f3de47dca05e667a8e537c821a SHA-1: daf848f5dbb54d889daa4f9de365d2d87f29fae7 SHA-256: 947e24d48baaf7581445bcf12648186f91cb63e25852f7fd13de09c0ec7b0656
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=ku+admission+2019+form', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Ku admission 2019 form', suggesting a lure to trick users into clicking the malicious link. The ML classifier also 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=ku+admission+2019+form
    • http://kafenipan.gaswog.org/uploads/1/3/1/3/131398591/a1c26c2e8d5aff.pdf
    • http://files.lisakerriganmichel.com/uploads/1/3/1/1/131163579/a40136.pdf
    • https://cdn.shopify.com/s/files/1/0437/0595/8565/files/adobe_after_effect_cc_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0462/6540/1495/files/bizas.pdf
    • https://cdn.shopify.com/s/files/1/0434/2392/4376/files/32000006840.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/fijivelijoroleperinano.pdf
    • https://cdn.shopify.com/s/files/1/0435/2360/4631/files/essilor_international_sa_annual_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/21280903179.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/25336001618.pdf
    • https://cdn.shopify.com/s/files/1/0439/3736/6174/files/mathematics_2_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/mehandi_circus_movie_video_songs.pdf
    • https://cdn.shopify.com/s/files/1/0439/7583/5806/files/tales_of_symphonia_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/74984284972.pdf
    • https://cdn.shopify.com/s/files/1/0439/1708/2792/files/11455273251.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066e9.bin
b1f22bf48eb91c28b12198f3f8bca3296837e88509c4129affb8f362411e0e26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E9 5472 bytes
font_01_sfnt_off0000796e.bin
2b8151d4d1768bdc0c97261ad6aea8d12dada5475554ae6b6291e9d17007002e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x796E 14876 bytes

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