Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c35650fba44e0c…

MALICIOUS

PDF

81.8 KB Created: 2020-08-30 07:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c8deb385250a7149b19cfde7eac9ff2 SHA-1: f46f0531137f813393769e3396896ec006be97d6 SHA-256: a8c35650fba44e0c0f32daa755f96a714469d138dbd39dcb7a1693e3435d73e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, forming a link farm, with one link identified as a malicious redirector. The document body contains obfuscated text and a URL that appears to be the entry point for the malicious redirector. The ML classifier also flagged this PDF with high confidence.

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=dr+reid+criminal+minds
    • https://static.usrfiles.com/ugd/b8c837_7b2b338978544c079b0d69c166f3ebbb.pdf
    • https://static.usrfiles.com/ugd/b8c837_5efe5833b3c54858ac7df3b96a4a7ffc.pdf
    • https://static.usrfiles.com/ugd/10b11f_1026de1d438c4c55a51f1bffa22402a9.pdf
    • https://cdn.shopify.com/s/files/1/0464/7705/0024/files/catecismo_maior_de_westminster.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5312/files/bmtc_student_bus_pass_online_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/89616623043.pdf
    • https://cdn.shopify.com/s/files/1/0434/4535/4658/files/gorewupujezan.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1832/files/worth_any_price_lisa_kleypas_epub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41758367329.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6594/files/exercices_corrigs_les_bascules.pdf
    • https://cdn.shopify.com/s/files/1/0430/7589/5447/files/78088823015.pdf
    • https://cdn.shopify.com/s/files/1/0431/2635/8173/files/apqp_process_flow.pdf
    • https://static.usrfiles.com/ugd/9cb927_f36839ace2674b2fad64f051a45fe2ca.pdf
    • https://static.usrfiles.com/ugd/8cbfce_ae080fd8d4294f70a265549acc375dfd.pdf
    • https://static.usrfiles.com/ugd/89064d_7c00848b87024bcda38d569c6a5ff127.pdf
    • https://static.usrfiles.com/ugd/b47706_b4ee125508794e35ac61548a9bfbe7ed.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_off0000f820.bin
cdd998bdceaa94a7c1e662b338098586789176bc1e334060411e4c62dcdea441		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 4680 bytes
font_01_sfnt_off000107d1.bin
04ba8de02970cc81d74d54032d6228d1b50bf6a3972185b1f8716ae932e80dfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 10568 bytes
font_02_sfnt_off00012bc1.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC1 4324 bytes

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