Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ebd4e1e43cbcc5…

MALICIOUS

PDF

56.3 KB Created: 2020-09-01 05:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70a30223b23091eea81924bf6c473b2d SHA-1: 386eef2c160e007089fc614f31f5f9c8a9606931 SHA-256: 02ebd4e1e43cbcc5bcff97a38bf3a7b0631a51f608f270b22559d5dbfd4b5b05
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/wix?keyword=appserv+2.+5+10+32+bit', which is also listed as a malicious redirector. The presence of numerous other PDF links suggests a link farm or a method to obscure the true malicious destination.

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.me/wix?keyword=appserv+2.+5+10+32+bit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/bf0735_5c3ffce486c34109884a46de814824e4.pdf
    • https://static.usrfiles.com/ugd/8ba634_1bd379d4cd444bd0973f2617396ca380.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0deb1a4376a435e96ca0521b9232cbe.pdf
    • https://static.usrfiles.com/ugd/b8c837_184f284dc41c41738d9cb2833859b8bf.pdf
    • https://static.usrfiles.com/ugd/8b4172_445b2e633d964b9db87462ec4dab5e6a.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4049/files/review_sheets_college_algebra_math_111_answers.pdf
    • https://cdn.shopify.com/s/files/1/0457/5975/8492/files/dixenolopufewezarisena.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/zemakajifuwarox.pdf
    • https://static.usrfiles.com/ugd/362633_fe5213ec6a794a918f9dcfae89e6f009.pdf
    • https://static.usrfiles.com/ugd/be19e1_45816f9225224e0287627db5fef4b025.pdf
    • https://static.usrfiles.com/ugd/74a852_f4ad77d1da1046b487c3157d2179aa46.pdf
    • https://static.usrfiles.com/ugd/cafc24_bb9595a3b094414ab1c91419c72864c2.pdf
    • https://static.usrfiles.com/ugd/b972d5_b4def10b8cc04498917ff10fcf398400.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f201087b05741799dd12326d283ecb9.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a2a1.bin
40a1d2c1f877731a87112bb59b1e1ba7212d506cdd4e6fa0b1138e65e5e24766		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA2A1 26872 bytes
font_00_sfnt_off000066d5.bin
79a8502c0ec8aa0e55fb0e5878a2ab94d5730931c7b9eefdc6dc73560d6dd543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D5 5404 bytes
font_01_sfnt_off00007959.bin
3db15c63d9f2ac3326208703ccc0b230768a59df25bbf63efe1571050a2a7b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7959 12912 bytes

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