Malicious PDF — malware analysis report

Static analysis result for SHA-256 2424fb7046f0bac9…

MALICIOUS

PDF

39.4 KB Created: 2020-09-01 14:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f505d42c26046ee5bf080dbc1dc5105c SHA-1: 261750c84b6b664ab0673b4964a836feb1c92f91 SHA-256: 2424fb7046f0bac9e0fd6c97548fe33e24214ce2d8e1494948610733dfc99c81
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with a keyword related to '3d tuning apk all unlocked'. The document body, though heavily obfuscated, also contains this URL and numerous other links to static.usrfiles.com, suggesting a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=3d+tuning+apk+all+unlocked
    • https://static.usrfiles.com/ugd/b8c837_38b229dc1e31431aaf3ada771b33d3cc.pdf
    • https://static.usrfiles.com/ugd/f4de5e_bc237f90453c4a5a9af13234bd855458.pdf
    • https://static.usrfiles.com/ugd/8cbfce_18185266abf343ad8d309d30057df128.pdf
    • https://static.usrfiles.com/ugd/b8c837_56d54847a64f4655a2ec39c63baa34b4.pdf
    • https://static.usrfiles.com/ugd/aef5b7_2fb1b1b6c492459c8f779894bf5dbddd.pdf
    • https://static.usrfiles.com/ugd/12f4eb_fdee34894e8b40ee8084787fd414ede4.pdf
    • https://static.usrfiles.com/ugd/5b9365_6da09c4a6df2410e81474f7d5af956e8.pdf
    • https://static.usrfiles.com/ugd/a58b01_faafa1d466a34e4ca9bf8a0e0696c75c.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gevuruliwineda.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29426312843.pdf
    • https://cdn.shopify.com/s/files/1/0467/5872/3747/files/81496521217.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/wakidegevilalatipavap.pdf
    • https://cdn.shopify.com/s/files/1/0431/6659/7269/files/nicktoons_basketball_pc_game.pdf
    • https://cdn.shopify.com/s/files/1/0429/2267/2284/files/adding_and_subtracting_decimals_coloring_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/65948152269.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cfa.bin
cbd8a260c638c64419cf450e10574197dbb020452e2bdd9a272694bb3a236852
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFA 5100 bytes
font_01_sfnt_off00006e6e.bin
78e53379e146ae818c459a6d8c2c341571288398113616f1a5e3f797278193c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6E 10076 bytes