Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f021b300b11d5dc…

MALICIOUS

PDF

45.1 KB Created: 2020-11-07 23:26:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4e4314c33d159646fe3f49c303d238a8 SHA-1: 37ea8eeb195a589d5b713d70f4a0242bb8601fd5 SHA-256: 2f021b300b11d5dca9a018c4c68be8836ab571829d2ae5e6a08d71701679e3f6
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous external links, many of which point to a redirector URL. The document body, though heavily obfuscated, contains the URL 'https://trafffe.ru/123?keyword=super+mario+flash+cool+math+games+online', suggesting a lure for free downloads or games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, likely for SEO manipulation or to host further malicious content. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?keyword=super+mario+flash+cool+math+games+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423155/normal_5f999fbb196c1.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/rujofapiwewutaf.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/toderit-xobotojezi-fiwolepuzupuzo-januke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_5f8e34f0bed18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_5f8c8b08d5823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406809/normal_5f9b18b238fe4.pdfIn PDF document text
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/buwotubegekolasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5f8bd13da9312.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/warapagefasovi/la_ilaha_illallah_muhammadur_rasulullah_in_arabic.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/dazamojugikepiwegugupuda.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/student_council_application_answers.pdfIn PDF document text
    • https://fodatus857065.files.wordpress.com/2020/11/nikkormat_ftn_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e4c9b4-ff81-48c1-a897-6bc7f2fed52c/9686084921.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/fnaf_sister_location_full_apk.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_off000070f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70F6 5532 bytes
SHA-256: ebd40ba9aacf28cb8597a68fa227dfc7353176b82d4bb124c986d34f540b2d95
font_01_sfnt_off00008399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8399 10452 bytes
SHA-256: 88d621403d82f9f69b5ac107097744b6455efc156442cf8bc8e5085465e0c63b

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