Malicious PDF — malware analysis report

Static analysis result for SHA-256 f244435cb91de72d…

MALICIOUS

PDF

50.2 KB Created: 2020-10-31 06:36:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 87696c8fe68f3d25f5b9f29df94e0a7f SHA-1: 90bdfffb678712f6148e5be44d6569680bbb60b2 SHA-256: f244435cb91de72da9f786359a317270900b42e3230eef84ea812754a0b5eb56
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.me/123?keyword=body+language+book+in+urdu+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_5f8c8389877a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_5f98c2f8bc65d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f8756ead6c84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375696/normal_5f8b4f2e82963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_5f994bd9001ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f88976305d0d.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/3532345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5f89493ad9507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f89343ba7791.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vonusirukete/the_blue_zones_kitchen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/7809/6296/files/sodepefekovixifenudimir.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/30784975320.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/describing_appearance_vocabulary.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000525d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x525D 3120 bytes
SHA-256: 750d1396ea0bf5fbbfb1efa7800930e25a2e400cebbc542b316d66b1e2c172b3
font_01_sfnt_off00005d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D92 5188 bytes
SHA-256: 233c3a8d98cba1d64f0a60f61f85d377731d665e51cd7823ef35a5c68ed9620d
font_02_sfnt_off00006f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F47 10356 bytes
SHA-256: 27d902d4e79e6e7ee750a83954024531a603cffbc6e2b96a21396aa56c9abe1c
font_03_sfnt_off000092ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92EE 17112 bytes
SHA-256: 7d209b77e5020c280088c765e7c4cd386aa79658885290b1f956fad5681d590c
font_04_sfnt_off0000ab58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB58 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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