Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b9a1eda4746101…

MALICIOUS

PDF

91.4 KB Created: 2020-08-31 01:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 280048a682f1332cb78f615217455817 SHA-1: dd666a66efed1f4b54bdf2a899c16cec25d7ce88 SHA-256: e7b9a1eda474610143b3e58bbde93f9264f3ee0e54843b197caadef1a2b783ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The embedded URL, https://ttraff.ru/wix?keyword=%25D9%2583%25D9%258A%25D9%2581+%25D8%25AA%25D8%25B5%25D8%25A8%25D8%25AD+%25D9%2582%25D8%25A7%25D8%25AA%25D9%2584+%25D9%2585%25D8%25A3%25D8%25AC%25D9%2588%25D8%25B1+%25D9%2584%25D9%2584%25D8%25AD%25D9%2583%25D9%2588%25D9%2585%25D8%25A9+%25D8%25A7%25D9%2584%25D8%25A3%25D9%2585%25D8%25B1%25D9%258A%25D9%2583%25D9%258A, is likely part of a phishing or malware distribution scheme. The presence of numerous other PDF links, while some are benign, suggests a link farm tactic to obscure the 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.ru/wix?keyword=%25D9%2583%25D9%258A%25D9%2581+%25D8%25AA%25D8%25B5%25D8%25A8%25D8%25AD+%25D9%2582%25D8%25A7%25D8%25AA%25D9%2584+%25D9%2585%25D8%25A3%25D8%25AC%25D9%2588%25D8%25B1+%25D9%2584%25D9%2584%25D8%25AD%25D9%2583%25D9%2588%25D9%2585%25D8%25A9+%25D8%25A7%25D9%2584%25D8%25A3%25D9%2585%25D8%25B1%25D9%258A%25D9%2583%25D9%258A
    • https://cdn.shopify.com/s/files/1/0463/3113/4113/files/vomejagunotajamegafejonin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5636/files/tremble_chords_d.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/gidojoputudob.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/discord_font_commands.pdf
    • https://static.usrfiles.com/ugd/cac9e4_506b8bcbb2914847a4b28561379f19e8.pdf
    • https://static.usrfiles.com/ugd/6f53d7_8e7707f23d4b44f8a541f30217e19623.pdf
    • https://static.usrfiles.com/ugd/221f3a_a5bd27a754274323b69de36c9edb8acc.pdf
    • https://static.usrfiles.com/ugd/4c1554_56a34fc875a94e44aeb20906c69c3c95.pdf
    • https://static.usrfiles.com/ugd/79e0dc_dde1356225664e08913cc5802c016353.pdf
    • https://static.usrfiles.com/ugd/5ed537_b57019c1c8974993b994c7354dfb32b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_feaca2158ed345b5a23ce8cb5d1b11aa.pdf
    • https://static.usrfiles.com/ugd/0d2908_076b47e42a3448b283fd7cf217962a54.pdf
    • https://static.usrfiles.com/ugd/824332_42aa775661854df4901b0598dccfc058.pdf
    • https://static.usrfiles.com/ugd/724bd4_919d212f8a1049de8766609b737bcbe7.pdf
    • https://static.usrfiles.com/ugd/b8c837_348a381b90e04564b8edfbc84f6041ee.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00012316.bin
324388bf837c6d40e8278c454baeed12a8ffd43902d4f65025a17b812cb80577		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12316 33452 bytes
font_00_sfnt_off0000da59.bin
88b4df287869f8a87cfca73fa70e055f9c8c0ff4f418bc447a4fa7089e3d2d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 4068 bytes
font_01_sfnt_off0000e838.bin
7f403a17b47dd433cc3383f334b910d61845806350cb53d6e24e0e9f016e5c53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 19152 bytes
font_02_sfnt_off000106ff.bin
f70ce989dc67a346985d6c320ca93183cc99fc04f32cc8fa97551ac4db1b62fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 8164 bytes

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