Malicious PDF — malware analysis report

Static analysis result for SHA-256 d565a244df99d0cc…

MALICIOUS

PDF

44.8 KB Created: 2020-07-25 01:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 043a0967aec54175f9a0c8dfa40a5907 SHA-1: 3317ffafee7e945632c4a7ec275ef2926b2551a6 SHA-256: d565a244df99d0cc7a1f7e27fbd36b42c31dc73331bc3f2a0e991def1b6d7150
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by a high ML classification score. The document body, though heavily obfuscated, appears to be a lure for a textbook download. The primary malicious IOC is the redirector URL, which is designed to lead users to further malicious content.

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/wb?keyword=prentice%20hall%20magruder
    • http://files.pennedideas.com/uploads/1/3/1/0/131070332/topedutawiduloriz.pdf
    • http://files.michaelstiertherapy.com/uploads/1/3/2/8/132816096/gibojifajimi.pdf
    • http://files.taniajanenaturally.com/uploads/1/3/0/7/130776104/mugosopi_jigakuziwon.pdf
    • http://files.optmlacad.com/uploads/1/3/1/3/131382092/baboliv_fixiwemegasulo_jajovo.pdf
    • http://files.michaelstiertherapy.com/uploads/1/3/2/8/132816096/gib
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2934473971.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7409/2196/files/28956773410.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/duwaxufezemurogagur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74535711799.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/71294384582.pdf
    • https://cdn.shopify.com/s/files/1/0431/6977/5782/files/14462071690.pdf
    • https://cdn.shopify.com/s/files/1/0440/6575/1192/files/tajowerekesonuzabawexoriz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/godemituj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3131/4077/files/44107217735.pdf
    • https://cdn.shopify.com/s/files/1/0436/5352/9753/files/92199434690.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.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_off00006f4c.bin
98e1bb38bf90812b1cf9afb057ef91c397d1a2d669ec9258a8df55e07491e24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4C 5952 bytes
font_01_sfnt_off00008365.bin
533fa628af96f7b20f80590c52263ec705d2165887946df44acafe36242fcaf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8365 9932 bytes

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