Malicious PDF — malware analysis report

Static analysis result for SHA-256 189ef3973af080fc…

MALICIOUS

PDF

64.7 KB Created: 2020-09-02 02:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06698e72c5677ba01649a3d7f856e256 SHA-1: 52f8ca9a2bcb494a227cbcf07c3e5c14bc4dc106 SHA-256: 189ef3973af080fc8c2284143cc899df604288f83518b991f00e4e0e80f97ada
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting the document's purpose is to direct users to malicious infrastructure. The presence of a link farm further supports a malicious intent to distribute traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.club/wix?keyword=sound+waves+physics+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/fd7405_df891e7f137d479cac3fac3583c9338f.pdf
    • https://static.usrfiles.com/ugd/b41a9a_92cc8b45cc1c4284b32e702f3bdb8262.pdf
    • https://static.usrfiles.com/ugd/bae363_4a9aea2ba04c4e11beb6cb36f974bc93.pdf
    • https://static.usrfiles.com/ugd/50c35f_ca4cad560f2d437794cbcf422bb9861b.pdf
    • https://static.usrfiles.com/ugd/9c0842_78b32cc2ac284965b8b749d5488de175.pdf
    • https://static.usrfiles.com/ugd/c162b3_c0999295efc34f2ebf38f1fdcea33879.pdf
    • https://static.usrfiles.com/ugd/b8c837_c49ec4f356cf4433a1fe6ccd20c323c1.pdf
    • https://static.usrfiles.com/ugd/3b7182_1a73acff771148478f055dac077e01e1.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_df18cc7fce35468b938c06b0ec005892.pdf
    • https://static.usrfiles.com/ugd/22bf55_97948f1b525a4096ac0753bf22180091.pdf
    • https://static.usrfiles.com/ugd/08e331_f3ef5327277a4be09dcdea7c39f79b2a.pdf
    • https://static.usrfiles.com/ugd/362633_e7c0e0e97ff3407ebcd3da4b4eb0d0c8.pdf
    • https://static.usrfiles.com/ugd/f103bb_6c37058daf2a44219f09ab4cfdf8a064.pdf
    • https://cdn.shopify.com/s/files/1/0434/1330/7541/files/learning_awk_programming.pdf
    • https://cdn.shopify.com/s/files/1/0436/6529/3462/files/kixafa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4695/1319/files/ansible_ini_format.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4969/files/91108785983.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/hyper_light_drifter_keys.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8d1.bin
f2a8282e52b601d785839616865689cf005ee494bac7aed83ddcad0925e380a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8D1 5472 bytes
font_01_sfnt_off0000bb97.bin
fa312cc6c92499d8b470b3b8bcfa48c11e59587e483ab13538ef6cc611a9871f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB97 10972 bytes
font_02_sfnt_off0000e07c.bin
5355995778af6fea050508ce4debc46bc2ba7deab687ac039556469e1bec84fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 16064 bytes

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