Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d01cba5ed61ca9…

MALICIOUS

PDF

60.1 KB Created: 2020-09-01 19:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34172e8f47f338a3c9212459edb5b3bc SHA-1: e4096bd7a21623b53f91ee3763f0afa8d90d9043 SHA-256: 31d01cba5ed61ca9d23f5552a10c88d69e67a4834fd4b4be1c0944b60c5e8782
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that aligns with the redirector heuristic. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, suggesting a broad distribution attempt. The primary malicious IOC is the redirector URL, which likely leads to a phishing or malware delivery site.

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=estrutura+do+texto+expositivo+argumentativo+pdf
    • https://static.usrfiles.com/ugd/b8c837_1cd91bdfa4a34bb08d5d7f50363254dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1667fa64fd543fe953a814bac626edc.pdf
    • https://static.usrfiles.com/ugd/f55bec_00feee9213594c22924fa5dbdaae68fa.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_619982cf427041a9a443a2a4e8b5eeba.pdf
    • https://static.usrfiles.com/ugd/9cc572_60947fbc9c374c63bd373a3d5c10d693.pdf
    • https://static.usrfiles.com/ugd/b4609a_81d44c4c10964c2cbf2b84986cfcba0d.pdf
    • https://static.usrfiles.com/ugd/d1d005_c525cd5d18a2437c865d3d65265044c6.pdf
    • https://static.usrfiles.com/ugd/cafc24_5d2ddcc219624f57b09c46e8c9f8d4f5.pdf
    • https://static.usrfiles.com/ugd/724bd4_9f7b77fc7e3645f6a0b1f9c68c0cbb5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3b7f89ebf664e7781ebe8447bac87b9.pdf
    • https://static.usrfiles.com/ugd/0df15e_8d9b4b9e7ef74dac93e1a1683c314ae5.pdf
    • https://static.usrfiles.com/ugd/c618e9_78be48f5c56b4713a4c6f442ba296c1a.pdf
    • https://static.usrfiles.com/ugd/008e52_fb07b680597b413dbf9b3e023b75771f.pdf
    • https://static.usrfiles.com/ugd/a467d2_7a84ad557e734687a5688aea035cc712.pdf
    • https://static.usrfiles.com/ugd/a72fa8_a64f7930cb654025bfdb6050af5b7f76.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008fa1.bin
00258025eec0a8795c5058d5a9fef07b38883dd5f265b9ad28ed113be647da78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA1 5416 bytes
font_01_sfnt_off0000a208.bin
2a2f786474f1dcef08136ac79440aa809cc019dd7696710dff6e8a31b61d4817		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA208 12956 bytes
font_02_sfnt_off0000c924.bin
cdd8b4c47a12941267801f2cbe3b136179401f5a5ae512e17a3a3a5872047b58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC924 16816 bytes

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