Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bb674b25c3ee82…

MALICIOUS

PDF

39.0 KB Created: 2020-10-10 16:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1105e29a56c9928edb7a53e845872276 SHA-1: b9e49dbc63d049b1f9a2e974265d5469d514a198 SHA-256: 33bb674b25c3ee8232e5b757d48c9c6bbd547c884cdc525ce9ef8c338ce6b64d
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, contains the URL 'https://ttraff.cc/pify?keyword=i+do+adore+chords', which is also flagged as a malicious redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm or phishing attempt.

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.cc/pify?keyword=i+do+adore+chords In PDF document text
    • https://site-1036733.mozfiles.com/files/1036733/22876378290.pdfIn PDF document text
    • https://site-1041208.mozfiles.com/files/1041208/febutof.pdfIn PDF document text
    • https://site-1037916.mozfiles.com/files/1037916/mokunasasuwonarotavape.pdfIn PDF document text
    • https://site-1042919.mozfiles.com/files/1042919/9892063997.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/0879/0175/files/death_is_nothing_at_all._it_does_not_count._i_have_only_slipped_away.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0300/5086/files/wakubisenaropajiwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/7767773574.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/1636/8540/files/foucault_sexuality_and_solitude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4dc8b50-3ec1-410b-b03b-c380cf5336af/vuzis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9063c1c6-67b8-4910-811c-dd87b4e90c64/taselatenopetoxaxudiwi.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_off000055c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55C0 4932 bytes
SHA-256: 30ffc6b0c6b67dc030b4174b198f4731e68c480ef4b871133cde688ce604b71f
font_01_sfnt_off0000667d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667D 13228 bytes
SHA-256: 16f09d997194becfb727ee99d1ff07da71627326d8f8fb88c38732f30d9b8406

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