Malicious PDF — malware analysis report

Static analysis result for SHA-256 654c15967306cad7…

MALICIOUS

PDF

43.4 KB Created: 2020-08-04 20:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 311a105a7346fff79da23bf5a694eddf SHA-1: acda5b09c5f0a959429338fa8505cdc571a795ed SHA-256: 654c15967306cad772d1414cce5fccb5b3aab8f75e8512094a25c7ac724cc71a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure for a "biology textbook answer key" which redirects to malicious infrastructure. The presence of numerous external PDF links suggests a link farm designed to improve SEO for malicious content. The ML classifier strongly indicates malicious intent, and the document's structure suggests it's part of a password-protected archive delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/pify?keyword=prentice+hall+biology+textbook+pdf+answer+key
    • http://files.cybersecurityinc.net/uploads/1/3/2/6/132681938/natuwafegaga.pdf
    • http://files.williamsburgrec.com/uploads/1/3/1/4/131437669/412f004.pdf
    • http://files.woodbrookhuntclub.com/uploads/1/3/1/6/131637081/pilokozan-wiforubin-zefori-kolezafodasidug.pdf
    • http://files.speiserlab.com/uploads/1/3/1/4/131410479/geteb.pdf
    • http://files.minds-eye-marketing.com/uploads/1/3/1/4/131410009/wezavuvogifazalokip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/21072752757.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/seborewusededuviwabija.pdf
    • https://cdn.shopify.com/s/files/1/0438/5911/6182/files/vudatowariluvikujedogu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/karulupavexamob.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/tikutowunekebuvisika.pdf
    • https://cdn.shopify.com/s/files/1/0431/5319/5165/files/72428852423.pdf
    • https://cdn.shopify.com/s/files/1/0437/0792/4635/files/acls_provider_manual_2015.pdf
    • https://cdn.shopify.com/s/files/1/0430/9254/1589/files/zotenutadafuduguwa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/75142680324.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/wilitokaxudiso.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/jiretirererigolam.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7384/files/advanced_excel_practice_exercises.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006200.bin
f6a40a394acc65c08a35d876b8dbe6ebcddb165c3ea45a2cc66fc5c4748e4a24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6200 5884 bytes
font_01_sfnt_off0000761d.bin
5d720be541251e794eedd9328b032627290050af6608da15227e5f18a6868bef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761D 13168 bytes

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