Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c58f8057a807b88…

MALICIOUS

PDF

45.3 KB Created: 2020-10-28 11:27:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 871ab3ba5cbc09bbee98eecf9f868084 SHA-1: 3a12693f0a80d628f32e6f93e3f762e6559b63f1 SHA-256: 6c58f8057a807b88226200b70d42467cbc2a60414bfa865ad8ce2c305c8a4e31
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to benign content, but one critical link directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector URL suggests an attempt to lead the user to a malicious site. No scripts were extracted, and the document body was heavily obfuscated.

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.me/123?keyword=abstract+painting+ideas+acrylic In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_5f95d1467d018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_5f8ecf623020d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_5f927d6856c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5f8f27b82e359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393647/normal_5f8ecfa268faa.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/laguduzud-duleneku.pdfIn PDF document text
    • https://givexikiduxa.weebly.com/uploads/1/3/1/3/131398224/purapi.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/vapofisasoxatu.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/2224018.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/zebapesuluboxaj.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/degisapemifa/bearing_number_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/fetal_alcohol_spectrum_disorder_fasd.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/59357331018.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/16153443260.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/acid_rain_introduction.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/31213831010.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1583/9645/files/lake_hartwell_fishing_report_july_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3251/0101/files/osha_scissor_lift_safety_checklist.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7481/7693/files/john_lewis_sacha_sofa_bed_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/jugawoguronovonosawap.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/adverbs_comparative_superlative_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/cardiovascular_system_histology.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_off000072cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72CD 5472 bytes
SHA-256: a3e25da68d3889f64b764e4bc75f4a6d10c40f64a9d7319ce4571e6aeeb289cd
font_01_sfnt_off0000856d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x856D 10104 bytes
SHA-256: c7eaf023f968365b145a673a34b8089aab8a611c533291360345b3c8b42facf8

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