Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6fe3d89620e19a…

MALICIOUS

PDF

42.4 KB Created: 2020-10-31 23:00:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8c76f2aec04dfbb762c12e6d0d91601e SHA-1: 91386237f0409a6b452cb4cd5169979b1f5d9b14 SHA-256: 3b6fe3d89620e19a8f8552b200fff13f22226fae7cd5b92da43dbf5aa163df68
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector and a link farm. One of the primary URLs, 'https://ttraff.cc/123?keyword=southern+california+capitalized', is flagged as malicious. The document body, though heavily obfuscated, contains references to this URL, suggesting an attempt to drive traffic to malicious infrastructure. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/123?keyword=southern+california+capitalized In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5f95d7c7554d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f92328579e07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f87882f961d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f8a23c5a700e.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/1/0504/6747/1551/files/86508874891.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/wegirabevugudezaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/risk_management_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/mowabegokitelavoriguzin.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/58372816473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/467a2785-d2b6-4c66-bd6c-e9ba8501e1d3/dupugodexalokonipuwisiniw.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/kisemalawodovujevujetakez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8782/9928/files/free_download_noisli_apk_a2zapk.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/wabufa.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/cover_letter_for_teaching_job_fresher.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 1

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_off00006758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6758 5216 bytes
SHA-256: 97d9833c9ce263a7283655379f112f9942a56ec03a6e6a730b4a1f72ef15883b
font_01_sfnt_off0000791e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x791E 10348 bytes
SHA-256: 0f4b20bab12b8206a252a6e4ae8e99aced0a9ce5c9028c63725eb5f42c9631a5

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