Malicious PDF — malware analysis report

Static analysis result for SHA-256 74896b745876cd7d…

MALICIOUS

PDF

50.4 KB Created: 2020-09-03 05:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1a2ca48ec6b092039946e7b42a5cd4f SHA-1: 40d5600d283a94a46d227a9e152ee29b4f84ae14 SHA-256: 74896b745876cd7da71f20d339e04347c3b2112d382799df33e462984e9b8625
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be a link farm designed to redirect users to 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.club/wix?keyword=best+chatbot+platform+2019
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_edaa6cb7a74a450c919441e89df33d72.pdf
    • https://static.usrfiles.com/ugd/510a18_5fe6a9e060b641f5a86ad5a7b318ae5d.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_1bf738e9fd694df19f4bc458f6b8e4f7.pdf
    • https://static.usrfiles.com/ugd/f3cb45_c6710561c4db486297012035af622c58.pdf
    • https://static.usrfiles.com/ugd/b3bc21_c56b4c93bf704383b1fe356426e58fc1.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_f92f0614d4d24b8bb43c5f583785066c.pdf
    • https://static.usrfiles.com/ugd/9d66c7_90757811d6e84a32aa164d4f9c2fd661.pdf
    • https://static.usrfiles.com/ugd/a98ecc_bc2df6eeb0064e868e3244ec5e9f699f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7101b0d36d224c09a1dfc957bd7963af.pdf
    • https://static.usrfiles.com/ugd/9b2d9b_7d48365c7dd947b48ddadf0d17946af4.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/23085053051.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/magopixatiwobuditediwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1669/1612/files/zodezuruwamawedulufu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/furupokexopaxabisovijuwu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6341/files/9891914054.pdf
    • https://cdn.shopify.com/s/files/1/0435/6636/6869/files/mowekedetinizufe.pdf
    • https://cdn.shopify.com/s/files/1/0428/5241/7703/files/motherboard_add2_support_only.pdf
    • https://cdn.shopify.com/s/files/1/0462/4479/0426/files/cateter_venoso_central_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/nopozovuka.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_off000077f8.bin
94187331561e6b4b1d210886f643e9a45f33476f43b6b6b88425da81bec21a29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F8 5560 bytes
font_01_sfnt_off00008adb.bin
c9a41b0d81b0089c96a39e3fbf43580468fd6cc2dd9b42f3fc7bb1a60548d784		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADB 10296 bytes
font_02_sfnt_off0000ae15.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE15 4324 bytes

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