Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b79512b87bd8448…

MALICIOUS

PDF

43.6 KB Created: 2020-11-02 07:24:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bcb43ab2a5c6c3ffd6ff97618d9e96a6 SHA-1: 746d1a28b2a1695cc5b4c5b89bcadda5f8e948d9 SHA-256: 1b79512b87bd8448a031b8f38c50a7563a23cbea607c85a196f47ad29c9ed980
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to redirector infrastructure and link farms, indicating a phishing or SEO poisoning attempt. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious linking strategy. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://ggtraff.ru/123?keyword=multiplayer+games+online+unblocked In PDF document text
    • https://vivazezege.weebly.com/uploads/1/3/4/0/134041722/wisariwopa.pdfIn PDF document text
    • https://gatilavim.weebly.com/uploads/1/3/4/3/134391542/06f880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_5f97eb1724162.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/1/0496/6871/8756/files/30063245133.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5751/9005/files/motomaster_eliminator_1000a_booster_pack_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3659/7663/files/86494647762.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6590/8123/files/brother_sewing_machine_manual_lx2500.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/kezunu.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/word_whizzle_old_school_video_games_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7737/9249/files/best_karaoke_maker_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5873/1429/files/instagram_messages_apk_google_chrome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/7247/1207/files/26293313809.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0376/7713/files/bill_cosby_net_worth.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0996/4694/files/easy_piano_songs_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/8973/9935/files/nemetenofepufufopeperop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6590/8123/files/plurals_worksheets_for_4th_grade.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_off00006a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7D 5704 bytes
SHA-256: 64775a7ed6a3c5982cfdc289c553a32b22336ae96b5c27977ba1c4b47abc4a8e
font_01_sfnt_off00007de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE4 10392 bytes
SHA-256: 74bd77ed931e28e106a881a521f1f560ca18ab34e29a18f8082cbd7f81228f5d

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