Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf32eb3c9c4131d…

MALICIOUS

PDF

49.4 KB Created: 2020-10-26 11:30:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0a3f6363c50c3ea60f6548a76842c13a SHA-1: 72228cdd8b41edc5b1e2888da22c454405e2a8b2 SHA-256: 1bf32eb3c9c4131d674ebebe49d34ff6042c47dde1f5d0b8a7900d80083ca0db
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one heuristic specifically flagging it as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches one of the embedded links, suggesting an attempt to lure users to external content.

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/123?keyword=ferrule+effect+in+post+and+core+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5f8a127a7d4fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f884a8d15628.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c3ab09-aff8-4a54-a81a-d32544dd2730/rogizikobisikebopidowil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6403acc0-3e2d-4e73-886c-f75f948c9bb2/line_of_symmetry_worksheets_for_grade_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab7cd01-0793-4d63-abf2-d4293dbe5bdf/rawukabepivejovugat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf73df5-dd73-45f4-abd3-dd4b477930bf/kebotagu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9148/3032/files/38534742349.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4256/1433/files/guligowawelupekizumadoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9252/3675/files/684590241.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/lipid_profile_test_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/xunaxisuwaxawakajegobexu.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/43028362494.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4745/1798/files/sonil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3540/1112/files/nilek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9961/1047/files/veroxalikevulofo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2679/2093/files/dumikaposelijuret.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3075/5503/files/outlook_android_add_shared_mailbox_exchange.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9317acc3-721c-4075-a5f7-0f96ebe688ae/xakoviwuviguxewanixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d47534-72fb-4a15-9821-35d90e820d16/mijafawaso.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_off000082db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82DB 5104 bytes
SHA-256: 01cdade91bed1a5913d0e1c4d5e9ea27504d070bd5dcce4bf5e01a417980e735
font_01_sfnt_off00009442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9442 10912 bytes
SHA-256: 8870ec66ace1e7224b935252e5f994d72907ddf0331d26ac38feda83b53c6ace

Open this report in the interactive analyzer, or submit your own file for analysis.