Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0cb062176d33e3…

MALICIOUS

PDF

43.3 KB Created: 2020-11-02 18:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fa3bf7e1a0a022a4113565da50979465 SHA-1: 975d8a23b91c5a618a3493fa7afbb367832ea2e2 SHA-256: 3b0cb062176d33e33c71413cd186f1e5c9fe4860600eb05a7fe644048972e99b
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches one of the embedded links, suggesting an attempt to lure the user to a malicious site.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=harmful+archaea+to+humans+examples In PDF document text
    • https://kopezemab.weebly.com/uploads/1/3/4/3/134339977/f555b54b8.pdfIn PDF document text
    • https://ruzunaxatan.weebly.com/uploads/1/3/4/3/134340268/suvunugamed.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/bakinonififuko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_5f935bfe2b88f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_5f8e1ce834793.pdfIn PDF document text
    • https://letolonenuxe.weebly.com/uploads/1/3/4/0/134095956/4230915.pdfIn PDF document text
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/vijeruworupo.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/loxovijevifam.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/e0987752-7526-4e7a-bf46-0173e57f2f55/dotowotukogas.pdfIn PDF document text
    • https://s3.amazonaws.com/moxekibupuru/onlyfans_bypass_lock.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4672/2965/files/ovo_cool_math_games_hacked.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/zoxotufatitirobelulerewak.pdfIn PDF document text
    • https://s3.amazonaws.com/sanekufiwumafo/80005770856.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/alleluia_di_cohen.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_off00006b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2F 5284 bytes
SHA-256: 6261aca2911b5b054c1e3419d2190f9438d06dd162c2bd6e99ce9b50d6e61770
font_01_sfnt_off00007d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D03 10288 bytes
SHA-256: e2cb462dc8b636f91fef4cacad7de901acd0155fd9b3afabbc6f3af25b07c37d

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