Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9884459d33d43a…

MALICIOUS

PDF

57.8 KB Created: 2020-08-11 06:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfe5afdd72cbc515fc8572ec4544185d SHA-1: 0a7f6eb4abff854085b9eb3195bc66888d29e71e SHA-256: 0f9884459d33d43af4e540db33315f729c52a205c660994bdf939d618dbd39eb
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as an IELTS vocabulary PDF. It also exhibits characteristics of a link farm, with numerous embedded links to Shopify-hosted PDFs, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or malware distribution scheme.

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.com/pify?keyword=ielts+writing+task+1+academic+vocabulary+pdf
    • http://files.romemta.com/uploads/1/3/2/8/132815175/guzulugizoxupilaruz.pdf
    • http://files.shannonmcferrinfineartist.com/uploads/1/3/1/3/131382406/razudekatuvisugudona.pdf
    • http://files.mikkiscreations.shop/uploads/1/3/1/4/131453053/lazopuwuwokes_vuxewadejene_xizumox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/15392694478.pdf
    • https://cdn.shopify.com/s/files/1/0435/6099/2927/files/pardoner_s_prologue_and_tale.pdf
    • https://cdn.shopify.com/s/files/1/0429/7824/6815/files/66278714082.pdf
    • https://cdn.shopify.com/s/files/1/0434/0911/3242/files/bienestar_laboral_en_una_empresa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6508/9941/files/genesis_kodi_not_working.pdf
    • https://cdn.shopify.com/s/files/1/0449/4472/0040/files/patanjali_ayurved_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/girovabawunezaboparurov.pdf
    • https://cdn.shopify.com/s/files/1/0435/2668/4824/files/7977559380.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/1916295349.pdf
    • https://cdn.shopify.com/s/files/1/0428/3272/4124/files/vogogubufake.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/sagasudevit.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/article_about_globalization.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a8f.bin
5cba803ff1b2b7ebc77eed1cca10685392d9c0aac8bcb42b95b71df210d9d753		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A8F 5924 bytes
font_01_sfnt_off0000aeba.bin
e41fd9fb6bf6980493b42ac691f9d5654d35a7fe5f3fcd31cf23b2f402b5af55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBA 13600 bytes

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