Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b8d1aa52857f87…

MALICIOUS

PDF

41.7 KB Created: 2020-11-01 21:48:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cc44715cb2c4f362254857cdae7bc253 SHA-1: 5bcf92543de8758a474b208483b294776b68bc4e SHA-256: 19b8d1aa52857f87ae7f9cb68c9f78449f9579c8e67e013c9fc3ee662743e2fa
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ggtraff.ru/aws?keyword=mit+app+inventor+2+scan+app In PDF document text
    • https://wanuwoziburake.weebly.com/uploads/1/3/4/4/134458428/xiborudaga.pdfIn PDF document text
    • https://kakakirikixego.weebly.com/uploads/1/3/4/3/134318951/2d4fa57.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/kegibeziwekim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5f8f3703d7eae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_5f96fefb1e544.pdfIn PDF document text
    • https://luwibizikowar.weebly.com/uploads/1/3/4/4/134483868/xopol.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/1/0431/2147/5738/files/doctor_strange_nightmare_actor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0508/6517/6726/files/swap_meets_2020_perth.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4768/8091/files/muwumofoxagesuzibodobo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/8256/5782/files/18952088980.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7987/4213/files/63218989713.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8834/9846/files/folaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9333/7281/files/33794080886.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0230/3893/files/24999218746.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_off000063d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D8 5092 bytes
SHA-256: 1dd5a7792af25a62f8a52debb46499d70adc415720f01f63d47723f538a451c5
font_01_sfnt_off00007547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7547 10976 bytes
SHA-256: 6b74f8c3cfd64c0a2d39f735e663e430090356bf0c880e19707b71782c7973a8

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