Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c55902d153ece9…

MALICIOUS

PDF

55.8 KB Created: 2020-08-31 00:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3d116abc1b7053cb9c7efb9fca1e0bf SHA-1: 81e3d9a331eb07063a6e674508a2466a88f2c5a7 SHA-256: a9c55902d153ece966de850ff59fe8f5d69d28d33d8b05bd8613d3f32c9acb66
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt, likely to obscure the true malicious destination.

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.ru/wix?keyword=aliments+acides+et+alcalins
    • https://static.usrfiles.com/ugd/0c41e7_54c40acca8be46a88183ae14a66f2a7f.pdf
    • https://static.usrfiles.com/ugd/ac51ce_c5af30836d9a40ba8a803b3660c0821b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4bfb0dd6b0f4d5e8e6c4e3e37471460.pdf
    • https://static.usrfiles.com/ugd/d1c05f_0510045b6edc46ed8d776c17d015ef20.pdf
    • https://static.usrfiles.com/ugd/90423f_a0662861780647c98b0e04fc405ed0ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8f9203f2bd8442da0d253efdafe0730.pdf
    • https://static.usrfiles.com/ugd/b8c837_adbeaf83cda6478c97d63ead09e9c5b8.pdf
    • https://static.usrfiles.com/ugd/217d68_b18b5b48dba5404e89a1f287dab43f7f.pdf
    • https://static.usrfiles.com/ugd/c068f8_e43e520ed9e7432c9f28b5a9884ec313.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7dec993685842a59996048e02d31b77.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/pujojivap.pdf
    • https://cdn.shopify.com/s/files/1/0433/4039/8750/files/94920971698.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/fifeselovixubiwofoxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/1762/4990/files/fogajimati.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/april_2020_current_affairs_adda.pdf
    • https://static.usrfiles.com/ugd/b8c837_d422ec1068354474a274f0a8a3d3554d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8333e51fbd040d286aa09d763f6a548.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_3cfe75904e2c46e3b922cbdb44f22ce3.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076cb.bin
e7bf51c1719b26743fa3fefbe16ebd984c4d444b3359455c089d0881edd9e438		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76CB 4656 bytes
font_01_sfnt_off0000866d.bin
f7af2333d593e2e37486649abecf9ee4a9dc9c8f8975134a2609329be7dd91be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x866D 12044 bytes
font_02_sfnt_off0000ac83.bin
4737f6cfef85770128e047f524c2f4cf39220b401ed1e61759cd467f3096abd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC83 16300 bytes
font_03_sfnt_off0000c210.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC210 4324 bytes

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