Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5845be2b5690745…

MALICIOUS

PDF

40.0 KB Created: 2020-11-01 03:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1940847e279d70f309c703796f4cb6ed SHA-1: 59adb09dd3876c9931bb1931030793c3a62cb1d6 SHA-256: c5845be2b56907456c2bf6ca4028da86f5eb7ed659c63f9c44beb75bd9677d6e
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, which in turn hosts a large number of other PDF links. This behavior is indicative of a link farm designed to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier strongly supports the malicious verdict.

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=function+or+not+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5f93cf776da85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378855/normal_5f8b9a59aa09b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381529/normal_5f931209ab117.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/divemoros.pdfIn PDF document text
    • https://kenolafopufa.weebly.com/uploads/1/3/4/5/134528829/tuxenesavanawosurufo.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/ee76a0a452f69ac.pdfIn PDF document text
    • https://xulajaxosu.weebly.com/uploads/1/3/4/3/134366267/3900314.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/sugaguxagu/rikosurukamezuxegusezis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9503/8888/files/sheila_on_7_itu_aku_mp3_wapka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7708/9435/files/35976664525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9417/8490/files/97257827704.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6635/8436/files/judicial_restraint_and_judicial_activism_similarities.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/free_bangla_golper_boi_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0508/0095/1454/files/time4popcorn_android_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/5831/2366/files/bluetooth_apk_free_download_for_pc.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_off0000610d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x610D 4756 bytes
SHA-256: 05f85f3b324f21bd8873701e0ba7545cab1bb64c6bec6214f5e40a9a89ea6bd6
font_01_sfnt_off00007152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7152 9976 bytes
SHA-256: 87b1baca3986f29a15024589beb634652e850ec34660edb26e0284ad49302d9a

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