Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed5c41840ce3712…

MALICIOUS

PDF

43.1 KB Created: 2020-09-20 21:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 43d1aa1eda97d80a9b4065736fd55526 SHA-1: be3df268cc2859a887ef9a1739b5f7f3ae9b4a0f SHA-256: 1ed5c41840ce37122fcd02383b1906e29abd3cabd8e2e908383f254e4cdf39cc
162 Risk Score

Malware Insights

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

This PDF document exhibits malicious behavior by hosting a large number of links, many of which point to other PDF files, creating a link farm. Crucially, one of the embedded URLs, 'https://ttraff.me/wix?keyword=download+apk+uc+browser+apkpure', is identified as a malicious redirector. The presence of a download button lure further supports the malicious intent. The document's structure and the ML classifier's high confidence score indicate a deliberate attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=download+apk+uc+browser+apkpure In PDF document text
    • http://files.meliousphotography.ca/uploads/1/3/2/3/132302888/8481841.pdfIn PDF document text
    • http://files.jbclassiccars.co.za/uploads/1/3/0/7/130776158/morajeg.pdfIn PDF document text
    • http://womiwimi.nashreconnectivehealing.com/uploads/1/3/2/6/132696398/samokelil-ruzufagewobojuz-muzego-kemiwidifip.pdfIn PDF document text
    • http://pazereb.shrewsburycobblershop.com/uploads/1/3/0/9/130969690/5872923.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/1/0433/0687/7080/files/fimovubonivunab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/dulce_et_decorum_est_pro_patria_mori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/barbie_princess_charm_school_full_movie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/80078443642.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8892/8150/files/lanibisopuvufuragiwatigan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/dexobosupomuxerizebijavik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1624/0807/files/99324848101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1471/6572/files/biomass_energy_technology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/econometrics_exam_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5372/7394/files/kedefujusasolo.pdfIn PDF document text
    • https://683f5fb0-8bcb-47a5-968f-c233876dc932.filesusr.com/ugd/843280_efb35a8e298d4c448d17330127a0a575.pdf?index=trueIn PDF document text
    • https://32a2fe7b-50f3-43f6-97c7-c9a7da7f63fe.filesusr.com/ugd/843280_0c9e6b4ed7c140a1870d140fd3f5f7ec.pdf?index=trueIn 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_off000069ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69AC 5364 bytes
SHA-256: ca62ab5c087fd1d7d39558f19d4e542305167c44effc33a20de63e11e2cc8caa
font_01_sfnt_off00007c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C06 10376 bytes
SHA-256: 78b680519d7576d05454c97d14444abbe7f0dc7558a7a2ebf665b66bebf73694

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