Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcc8765ba709f28…

MALICIOUS

PDF

73.7 KB Created: 2021-01-06 05:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c7d381b077f6a8a09da123612a1a0025 SHA-1: ef759a06ba89f54536484cb34d52262521ba9cf5 SHA-256: 7dcc8765ba709f289e706f451a65d3c859bc4499ded083c0d22e3b90729dc5b6
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One of the primary links redirects to malicious infrastructure. The document's content appears to be obfuscated or corrupted, but the presence of a malicious redirector and the sheer volume of links strongly indicate a malicious intent to drive traffic to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/aws?utm_term=cuphead+soundtrack+piano+sheet+music In PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/7358976.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/tajugebin_rozisirugesepu_rezet_wejawa.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/wetowuzuxit/xavezaj.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/awkward_moment_card_game.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/manual_de_despiece_jeep_cherokee_liberty_2004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0da737-d30a-40f3-9fb5-01f77145202f/ebay_samsung_galaxy_note_4_unlocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae2f093e-d08e-4f22-9756-90abea1fa144/ginarevoseborixu.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/speedometer_for_gta_san_andreas_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/auto_submit_form_jquery_load_page.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c49e41e-8bd3-4795-85ba-5090f7e405f4/black_ops_2_game_save_editor_ps3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b1b0c45-1d39-4865-88c7-ce2150654df2/immanuel_kant_critique_of_pure_reason.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/towuzozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad045bc-14d1-4ba0-b98e-474c13b0f928/i_cor_1115_commentary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca70203f-61ec-4359-9115-9383e9aa291e/water_bottle_challenge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/981cfca8-a55e-4d75-8d75-ea438d1b01cc/jozifomorodobagepujobasom.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/22698442208.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_off0000e4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AF 5252 bytes
SHA-256: 24ec8d266fe40220e198284733b5676ac1b5da4564b761d63f7726b5c0bc1985
font_01_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 10628 bytes
SHA-256: b191770d1c59f83ecca5fbf41c45b779ee5610c53e9f29c3b013b72eb8c9cedf

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