Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fabb717d302a9f…

MALICIOUS

PDF

45.3 KB Created: 2020-10-26 20:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7bbe571069caa8baa7ab0db06b3a97aa SHA-1: 2ad91d7bf2bdc6fd265c217bd243879b7f2807bb SHA-256: 31fabb717d302a9f1f39ef3057a5da798751a823656fb64628f9e3c3fcf4aeab
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a redirector and a link farm. The primary malicious URL, https://ttraff.club/pify?keyword=agarest+generations+of+war+marriage+guide, is used to redirect users, likely to a phishing page or malware download. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to trick users into visiting malicious infrastructure, consistent with spearphishing.

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.
  • 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.
  • 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.club/pify?keyword=agarest+generations+of+war+marriage+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f8ddbd3a3d75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f8ae83883f70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_5f93e110e3f99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_5f8f03ebcfca3.pdfIn PDF document text
    • https://delimilakemasuj.weebly.com/uploads/1/3/4/4/134400920/zuvapolunogo.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/vaxusukoza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9107/4976/files/dd_3.5_character_sheet_fillable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5574/1589/files/legavonekebu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2496/0664/files/43278608923.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3097/7434/files/geometric_algebra_for_physicists_chris_doran.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/guwumaripulipubid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6752/2237/files/download_latest_facebook_messenger_app_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0813/0213/files/2019-2020_testing_calendar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9135/4534/files/stl_file_viewer_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/70834217463.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/fexipekonozesunujadedogiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7374/7140/files/toyota_vios_e_manual_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8797/6864/files/susajidizogapezogiduporo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6093/1991/files/fupewepep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6389 5156 bytes
SHA-256: ad08e0bf05474a55161986ab617741c8d0efd77e2f354486a7ddb6cec72aa82d
font_01_sfnt_off0000750b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x750B 10792 bytes
SHA-256: e0084bb7381167b304b6ef54950b89a4cdac61d6345505a8d55d5c3264c4965a
font_02_sfnt_off0000999c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x999C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2