Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ae49e30fc2a937…

MALICIOUS

PDF

52.3 KB Created: 2020-09-02 03:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc7fb143f1fc00332e19a2ca7e8bc6bc SHA-1: d162ed2bd71e907798a50d54f623db6931c9961c SHA-256: 16ae49e30fc2a93774430f4e823f0112ff34f0a4989a7ec038b59722c779f2d6
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is used to lure users to download potentially malicious content. The document body, though heavily obfuscated, contains the same URL and keywords suggesting a lure for a game mod apk. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • 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.
  • 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=game+beholder+mod+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/963627_9ed195764564475c9d5b69360493542e.pdf
    • https://static.usrfiles.com/ugd/1479de_e0d6c14d0d90406695807e026cc4eb4e.pdf
    • https://static.usrfiles.com/ugd/625844_5beb6505093f4d918c158b48f3a55b94.pdf
    • https://static.usrfiles.com/ugd/5de1df_ba1fe58ace9d47edad00c17a37220294.pdf
    • https://cdn.shopify.com/s/files/1/0433/1002/2814/files/excel_sheet_to_calculate_compound_interest.pdf
    • https://static.usrfiles.com/ugd/735424_e9679bd25acb44d28727c57a163bc34e.pdf
    • https://static.usrfiles.com/ugd/08fe48_fd0dcdb62986479ab45a2d8810634aa4.pdf
    • https://cdn.shopify.com/s/files/1/0464/4981/9816/files/duplicate_entry_in_excel_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0464/6495/8616/files/baal_veer_movie_video.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cfe.bin
2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFE 6440 bytes
font_01_sfnt_off00006cf3.bin
288654f455905cdc61cd1b1676a0fac763070d9c7d37d0f1d61bb01c808617b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF3 5256 bytes
font_02_sfnt_off00007e94.bin
b64f97fda75437041137a4e5809ce5254bf2b70a26849be5afb1b5250f472f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E94 1988 bytes
font_03_sfnt_off00008823.bin
dd02a9e15848e9a062b85a20b01741c34dbfac98b1bfeeab7b6c06e2f293ccd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8823 10668 bytes
font_04_sfnt_off0000acd2.bin
b262724a35de2722cfb01aeeae9bab4bcd4492d3c2fc840fb2ed7959c4f80e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACD2 16704 bytes

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