Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13e3bc0137e7105…

MALICIOUS

PDF

51.0 KB Created: 2020-10-27 16:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fc1cdf7c8ac1d48f7730c8ad487c0af4 SHA-1: 97d797bb926a9bd8cde37563bdb8ceffbe6d8786 SHA-256: f13e3bc0137e7105098818061b21e0833bfa9823082d8ff8442bdedcf75d7be8
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ggtraff.ru/strik?keyword=the+art+institute+of+houston+phone+number'. The ML classifier also strongly flagged this PDF as malicious. The embedded URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content.

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://ggtraff.ru/strik?keyword=the+art+institute+of+houston+phone+number In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393029/normal_5f91900290b60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f86f84b5fbc3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/83489164696.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/antidiabetic_activity_of_vernonia_amygdalina.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/jeffrey_archer_heads_you_win_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/37037835112.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/36355106383.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/70166309454.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/23706185911.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/addie_model_lesson_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/fozulasamovivazul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144a6735-a7d4-4462-b3e9-cbe0945b4150/80667714731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774b769a-24c8-42bc-b0c5-bd8fe0205d13/legavaraf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a987d66-402a-45d5-b74b-8ca3dd000c5c/70198411519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e451026-5e19-42ad-85a7-9a29f357e729/toriruwojosemek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e6b30b8-0e3d-43a9-8617-9b0d929b27ae/befesekelak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaf4103c-82a3-45e9-85aa-9a020125d80f/vazixaroza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db61c13-438d-45ae-9464-90fddf914ed6/number_patterns_worksheets_grade_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/982c028c-f053-4a84-be51-5495bddf0b7c/57602485623.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00009389.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9389 24364 bytes
SHA-256: f4ed5acebf10445a54b8a78ba3f4a36387fdb2082ac380aee9ff7cc128af8187
font_00_sfnt_off00006011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6011 5200 bytes
SHA-256: 40d5005522cee76b59c6ab4c0fa2b2ccbb6f6628d5ebc991fb7cf0966308114b
font_01_sfnt_off00007190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7190 9972 bytes
SHA-256: 53af518075daa08c787c9c01dd59bf136af4f5db5f7ad64577698f88eee8b887

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