Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e1eb1dc9c69ca4…

MALICIOUS

PDF

51.6 KB Created: 2020-08-31 16:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3563dcf7af18daead434feacb70c9b0b SHA-1: 4239a9ce71d50bc3fd63f29943e9a83fe988370f SHA-256: b7e1eb1dc9c69ca48c0d261c4ba2c3b1d1bbb8488aaea79a70629216c6f407d1
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.club, which is likely used to deliver further malicious content. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to citation formatting. The presence of numerous external links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to increase visibility of the malicious redirector. No scripts were extracted from this sample.

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.club/wix?keyword=como+citar+bibliografia+vancouver+pdf
    • https://static.usrfiles.com/ugd/b8c837_4d0dcc6942254291ad08b1dd63b43c85.pdf
    • https://static.usrfiles.com/ugd/b8c837_d062b4173d9440a387dc93ee47a0c1d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_51e18f378204404bb747b8fc34048345.pdf
    • https://static.usrfiles.com/ugd/b8c837_8044156f805f40a69bad78bffe15a3af.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5031/files/rixarejuriwifutuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/1775/6062/files/vcf_to_converter_apk.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/313075025.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe4d156699cb4103ae10e8fb5e5bc39a.pdf
    • https://static.usrfiles.com/ugd/4826f5_4cd114894ab9474b98c5ea7312fdc7e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_1796ddaa77c143c68fd607b0def975dc.pdf
    • https://static.usrfiles.com/ugd/cc03df_ea5df9c081e64038bd8852d6ed93e82e.pdf
    • https://cdn.shopify.com/s/files/1/0435/2317/8656/files/bathymetric_and_discontinuous_distribution.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6307/files/44552990715.pdf
    • https://cdn.shopify.com/s/files/1/0435/5761/7823/files/muratibo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/gipugumokorirolaju.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_off00007897.bin
dde622cc9f00f915be7c4b97aa500efc4b68dd005bf68f0c0fe8bb65d7d1bf4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7897 5404 bytes
font_01_sfnt_off00008ae3.bin
ecf644ca0e5b0688c30b4cbca16bd248c3a58dd449ee76989713911ef2a9552f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE3 12680 bytes
font_02_sfnt_off0000b1a8.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A8 4324 bytes

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