Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e76c63f661824f…

MALICIOUS

PDF

46.8 KB Created: 2020-09-10 22:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f41eb914bbc7d6122055fc88e032a98b SHA-1: 9212b8e36bbaa5d0d153d729d9d2f7b86aeb603a SHA-256: 28e76c63f661824f91aa4e33da36b455dc98feaaff1244adbbc1c9856689ae0c
152 Risk Score

Malware Insights

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

The PDF file contains a link farm and a critical redirector link pointing to 'https://ttraff.link/wix?keyword=vidmate+video+er+latest+apk'. This indicates a social engineering attempt to trick users into downloading potentially malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the exact payload.

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.link/wix?keyword=vidmate+video+er+latest+apk
    • https://static.usrfiles.com/ugd/b8c837_557249ec494e4881a9f2d85c22145eb4.pdf
    • https://static.usrfiles.com/ugd/08fe48_7d05c58223204ffd8a58f7f9c490e639.pdf
    • https://static.usrfiles.com/ugd/952c2e_68709a6403194f128b354d1fe21757af.pdf
    • https://static.usrfiles.com/ugd/d4da64_436eb39a7a5f4d9d86b1ed1438e501a4.pdf
    • https://static.usrfiles.com/ugd/31593d_e9e97041bdbe42a8b8643420f329edfa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8712/5910/files/avengers_theme_trumpet.pdf
    • https://cdn.shopify.com/s/files/1/0432/8793/7179/files/tamomebamagozekewunusula.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/girulogukojelojejukinozu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2281/8200/files/bilumatetidokaku.pdf
    • https://static.usrfiles.com/ugd/b8c837_2da413f5cc3649dbbd2e5839352d23f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_4cea11174dbc44afa9a07ec8658a7a10.pdf
    • https://static.usrfiles.com/ugd/451461_53df9928d7144f1f922b91c7d62f1332.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_9408bece01784ce5b636337b90481eaf.pdf
    • https://static.usrfiles.com/ugd/9c58c5_361b664e322446cea892ead5d23cd84b.pdf
    • https://static.usrfiles.com/ugd/bd5c68_dbf485bd097b4adb89a9a1314c666ea7.pdf
    • https://static.usrfiles.com/ugd/8aba0c_03d0db1397ed43dfb87d6b76e61fd124.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_off00006701.bin
d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6701 2952 bytes
font_01_sfnt_off0000718f.bin
cb3e349a0edd0ab9234b892b88931ca128fd20caf4f078d5477b8940f854df82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718F 5192 bytes
font_02_sfnt_off00008329.bin
97350ed1aa4855a1c05dba98f7f60d92b0446d1b21755ab51fc95ea1eb1e99fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8329 13420 bytes

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