Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b0c2ba4cfc9737…

MALICIOUS

PDF

36.5 KB Created: 2020-10-25 04:31:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3dd1276b0c9e08346b08e1736ba63ca8 SHA-1: c0e59cf1cc2754a66479c942b25401825324c3bb SHA-256: a8b0c2ba4cfc9737541397ddd26e22a5a2229f78104dc8506d292ceeeab8966a
174 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to an 'antonyms worksheet year 2'. The presence of a malicious redirector and a large number of external links indicates an attempt to drive traffic to malicious infrastructure, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.club/123?keyword=antonyms+worksheet+year+2 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5f94df2c9be1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5f94d9312f8b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f8eff5933b75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f8b715662339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f8ef948461ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_5f922a80e4114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5f8b45eb00666.pdfIn PDF document text
    • https://gumomamomav.weebly.com/uploads/1/3/1/3/131398069/rikebexujikezesirawo.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/gorogogekiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_5f9203b262b77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5f894b131595d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_5f8a490223b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f8c8c5b319d3.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/leguvefu/salisekoxufibamagise.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/12868480207.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/bank_audit.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/el_imperialismo_siglo_xix.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/succeed_in_cambridge_english_starters_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/87938176507.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/mathematics_grade_10_free_download.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_off0000506d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x506D 5272 bytes
SHA-256: 99aefa2d9c54cbe8d7af78fcc8820a95abdf4371de943a2eb1238b8c04bbe4bd
font_01_sfnt_off00006247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6247 10148 bytes
SHA-256: 4d4a8b303f3403843c5d7496609bd32520279be6e889177a897e578daa3ed745

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