Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8c47e8eeb7a8ed…

MALICIOUS

PDF

41.3 KB Created: 2020-08-24 23:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9aac7e60f486d59e679fd5d15cd69d77 SHA-1: 3e5494091ed6f15b3d44d2ab679d919b9ea023a6 SHA-256: de8c47e8eeb7a8ed5792b1fbb2b068c6c55984698c0adfddd8e9d8e939b210b7
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a study guide and the malicious URL. The presence of a link farm and a high ML classifier score further indicate malicious intent. The primary attack vector appears to be luring the user to a malicious site via a deceptive document.

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=fundamentals+of+nursing+final+study+guide
    • http://files.romeprivatetransfers.com/uploads/1/3/1/4/131408100/jogijiri.pdf
    • http://files.magdazaslona.com/uploads/1/3/0/7/130776206/3c34241.pdf
    • https://cdn.shopify.com/s/files/1/0432/4209/4756/files/arraylist_two_dimensional_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/4650/9461/files/osrs_cold_war.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/wipagigavaxise.pdf
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/6562820360.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/app_to_annotate_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0434/7432/1560/files/caisson_song.pdf
    • https://cdn.shopify.com/s/files/1/0434/6383/5814/files/purple_dragon_knight_5e.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/almost_a_hero_mod_apk_latest.pdf
    • https://cdn.shopify.com/s/files/1/0428/2040/3356/files/7656445379.pdf
    • https://cdn.shopify.com/s/files/1/0430/5249/9095/files/86499952971.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7845/files/xapososezaxexeronitokig.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_off000063a0.bin
5570fce186fc8cf79754ccd1716f183944872c24f6b446e609dd8d527f8782e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A0 5284 bytes
font_01_sfnt_off0000758b.bin
64af0a23324e331bf626cd4e59098381dc5339b0ad25869bbb82f0fa82db0298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758B 10244 bytes

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