Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee45f164c3f5317…

MALICIOUS

PDF

51.7 KB Created: 2020-08-29 19:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8db42766e8474c7cdaa55660fa88de3 SHA-1: 8d17c50d9c79f0e29122d76315eaa9876a679f87 SHA-256: eee45f164c3f53176ed84b1b097735c692663d356362acf4e53e2bb5567610f2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends T1059.001 PowerShell

The PDF was flagged as malicious by an ML classifier and contains a link to a known malicious redirector (ttraff.cc). The document also features a link farm with numerous external PDF links, many hosted on static.usrfiles.com, suggesting an attempt to manipulate search engine results or distribute content. The presence of embedded URLs and the overall structure strongly indicate a malicious intent, likely for phishing or malware delivery.

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.cc/wix?keyword=quedate+conmigo+los+novatos+de+rio+n
    • https://static.usrfiles.com/ugd/b8c837_0d99c5cff958414d9f97e2035af8e32a.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_4c2e5f7def694b23951734f22154a2a8.pdf
    • https://static.usrfiles.com/ugd/158fb9_b11b4c68e418470b8b55be9af58d7d8e.pdf
    • https://cdn.shopify.com/s/files/1/0434/6940/6360/files/descriptive_writing_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/kalagesiwit.pdf
    • https://cdn.shopify.com/s/files/1/0433/9420/3806/files/povapiwoguweguza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.pdf
    • https://cdn.shopify.com/s/files/1/0432/6765/3795/files/jitem_i_ben_kurdum.pdf
    • https://static.usrfiles.com/ugd/7baf93_8ebc8c5dc0e549a881dfb3d06e3db051.pdf
    • https://static.usrfiles.com/ugd/b8c837_6192210d03ee4cd6b583e85abc2038a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_63fa5c06e79e4155b579388d06b9f5f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_1276160a6c1640e9867112061de85892.pdf
    • https://static.usrfiles.com/ugd/b8c837_31a8c369cba9457ca7d3468049512af9.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
font_00_sfnt_off00005071.bin
3c96a8ecf51712e7c614fdae659195796930e90d0bc2a60650bdd58d6ca6f918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5071 5380 bytes
font_01_sfnt_off0000629e.bin
ae9e9c0fccc2ac22860068e080c29df3fe1ad662eb6ac8b2cb3c20b8b091f880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629E 6748 bytes
font_02_sfnt_off00007877.bin
74fc81ef6bfe4a8248a1dd0c12ee740ad24faf5a5927062978dce1fc2b49554a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7877 16624 bytes
font_03_sfnt_off0000aad2.bin
096709ae1c89d28ffc4b472b38dc18595c7f7cdc10ad2571b867ebf5f0bbdf83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD2 16128 bytes

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