Malicious PDF — malware analysis report

Static analysis result for SHA-256 448680fed5126037…

MALICIOUS

PDF

39.5 KB Created: 2020-11-03 02:38:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5ad9a2a9e7d1391550d560a914a042a5 SHA-1: d5055765e2af6ae86f2cf2b06204bf01453e43a8 SHA-256: 448680fed51260378935a8c451b9b2191c8c298c59339c00b00fb876ad3ce1bf
182 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or link farms, indicating an attempt to direct users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of urgency and callback lures further supports a phishing or scamming intent. The document body itself contains obfuscated text and a URL that appears to be a lure for a 'GED study guide'.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?keyword=ged+study+guide+2019+free In PDF document text
    • https://juzomewe.weebly.com/uploads/1/3/4/3/134350864/9142995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_5f8f53a80092d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_5f90c3d5849b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417220/normal_5f9cc73a71094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5f9279cd98c47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378831/normal_5f94a4ce62075.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/voxipanovigepiv/disney_lyrics_aladdin_magic_carpet_ride.pdfIn PDF document text
    • https://s3.amazonaws.com/takeju/jefferson_starship_supernatural.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/a_view_private_instagram_profile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aaf6006-18aa-4c18-b57f-587f54aa82ef/star_wars_dnd_5e_character_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/the_crucible_act_2_reading_check_answers.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAE 5448 bytes
SHA-256: 5f0064b8d187366b9dd04e7410f9048353f3d0fb617543ee9d9c9ad95f4090a1
font_01_sfnt_off00006f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5C 10028 bytes
SHA-256: 4eb2b508461240d654b2491c20cb78ac6aed5024308b29f3735f3391f0eccf8f

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