Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fba5b364954a33c…

MALICIOUS

PDF

42.4 KB Created: 2020-11-02 09:59:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6a67ffdd59bf466fab8fa5760c99a081 SHA-1: 5cb1eba47bf652ceabf7dac7cb45b6b1d712c8a1 SHA-256: 8fba5b364954a33c1ecef4326b5cc8c50fce9f3bfd995824d1afeecc5b7d21c6
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'apk downloader' and a URL that likely leads to a malicious payload. The presence of a malicious redirector and a link farm suggests an attempt to distribute malware or lead users to phishing sites.

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://cctraff.ru/strik?keyword=apk+downloader+gd In PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/958736.pdfIn PDF document text
    • https://malinozibide.weebly.com/uploads/1/3/4/3/134380659/a5c680f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f92348367a21.pdfIn PDF document text
    • https://lesofetu.weebly.com/uploads/1/3/1/3/131378838/716945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_5f97ed9be8144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f994b66b40f3.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/jibepare-vudaramuzi-refirezagulele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_5f967131b315f.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/5012501.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/1/0493/1551/2479/files/tovaboxumebaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0926/0190/files/new_super_mario_bros_hd_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1211/8952/files/10871777783.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0667/3575/files/barbie_mariposa_and_the_fairy_princess_doll.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0741/6743/files/detergent_cake_making_formula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4347/7909/files/42746448128.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_off0000667c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667C 5096 bytes
SHA-256: 0a051e0d98ae237d9333e65a18c82456994ed9afda5f2b8c832922af93f08c4a
font_01_sfnt_off000077f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F8 10944 bytes
SHA-256: 19db8a5f2a3122b25c9df2137c94c81ea8daf6f50eab93e3c35e5af07dad3730

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