Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af6852d377e1594…

MALICIOUS

PDF

40.3 KB Created: 2020-10-29 15:58:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6f790245581482baa14661efde47e119 SHA-1: 7a339039b948bcd42b9f56ad19f90aee1d698729 SHA-256: 4af6852d377e15940db16cf10095a6558cd5190692d33da37912f40366558350
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier also strongly flagged this PDF as malicious. The embedded URL, https://cctraff.ru/aws?keyword=parts+of+a+wave+labeled, is the primary indicator of malicious intent, likely leading to a further stage of attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://cctraff.ru/aws?keyword=parts+of+a+wave+labeled In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/56541324241.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6651/0500/files/61397283925.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/58649770771.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1342/2753/files/gitamewowunepolefeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1164/5855/files/tik_tok_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1efdfd9a-cf3d-4d0e-9df0-41df2aedc9bd/67858082005.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/78187644980.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/55254580780.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9406/3269/files/tureng_sozluk_apk_indir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4347/7909/files/wogivikugut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2176/1194/files/88889753705.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/kovumetuvek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded20b4b-f397-4896-a329-012b16c87375/hay_feeder_for_horses_diy.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/analogue_and_digital_communication_systems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee64138a-2409-4fc2-a214-1be9c0dc6420/60338435814.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000604c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x604C 5192 bytes
SHA-256: 3f9dc14f6f7858dd2e661bc970627d5e50793fcacd14915fa3efc5f0ea8a6778
font_01_sfnt_off00007219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7219 10248 bytes
SHA-256: 1697de89a730888ea6c9069a0c7fa7d5db5e388664013903ed3b1be769a711fc

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