Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9d1159add54f3a…

MALICIOUS

PDF

44.5 KB Created: 2020-08-31 17:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d604063bf0bb28e632e1e0334a6504c SHA-1: 7f3a54c86c66c051c005a6ea0a60dec65cc0fa3e SHA-256: 5e9d1159add54f3a26d9828118e2896dc722c8f58a0cf4e2bca9f3c4932b5059
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, with one prominent link pointing to a known malicious redirector. The document body, though obfuscated, contains text related to "bts fake love english subtitles" and a URL that aligns with the malicious redirector finding. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

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.com/wix?keyword=bts+fake+love+english+subtitles
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7060/3932/files/29355908717.pdf
    • https://cdn.shopify.com/s/files/1/0434/0652/4566/files/akbars_manchester_menu.pdf
    • https://cdn.shopify.com/s/files/1/0461/0238/0708/files/57195061991.pdf
    • https://cdn.shopify.com/s/files/1/0437/9305/5904/files/nonan.pdf
    • https://cdn.shopify.com/s/files/1/0436/7931/8166/files/coloring_worksheets_for_second_grade.pdf
    • https://static.usrfiles.com/ugd/b85eb0_6d03110a7c8b49478ea12ed799805e87.pdf
    • https://static.usrfiles.com/ugd/ee6770_048ce958a3084694ab7fb412ba987f3f.pdf
    • https://static.usrfiles.com/ugd/a64c8c_44e91e0804234214be9994c9f2eace21.pdf
    • https://static.usrfiles.com/ugd/b8c837_35f541860a7a4d03b64aaf45e2b94f5f.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/5296912516.pdf
    • https://cdn.shopify.com/s/files/1/0431/8131/0114/files/50404342366.pdf
    • https://cdn.shopify.com/s/files/1/0431/4526/5318/files/bitdefender_free_windows_10_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/20438462299.pdf
    • https://cdn.shopify.com/s/files/1/0437/6464/6049/files/7667098423.pdf
    • https://static.usrfiles.com/ugd/784815_a265fc68f606437395b6a49d12ed406f.pdf
    • https://static.usrfiles.com/ugd/ab922d_71fc938731b64627a3668dc2de18d925.pdf
    • https://static.usrfiles.com/ugd/3f80ec_6524f88009fb467498260634fe987657.pdf
    • https://static.usrfiles.com/ugd/9ea91e_260b348e2dcd436d8ecd7d5af17a66bd.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063ec.bin
666e973f7e7321152d808a7e1b2e0e24542378bc906aa95edcba794f2c70f6e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EC 3032 bytes
font_01_sfnt_off00006ed6.bin
ea3df3a3bc7a229e8935b7cc9682458ac31defd94295ee6cce5d053c63b63a32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED6 5244 bytes
font_02_sfnt_off000080c3.bin
d714a95cd2a4a787c2138113e8ed91b1fb59c6d5e4e640c1f0db6b4066b3ff8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C3 10520 bytes

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