Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f85aea8a16f2974…

MALICIOUS

PDF

38.6 KB Created: 2020-11-05 04:53:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e9235732199fe56f4dc2701280bb6f8e SHA-1: d9c934f456cd830b3189847b5f4e2695b9311292 SHA-256: 4f85aea8a16f297401043f53190464fd062b79b98a3eb85a57b75c58180140f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to SEO-optimized PDFs hosted on S3 buckets, a technique often used to manipulate search engine results. One of the primary links directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/strik?keyword=lego+spiderman+games+unblocked In PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/6dbfd6.pdfIn PDF document text
    • https://rizadubarezesul.weebly.com/uploads/1/3/4/4/134499036/5418177.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://s3.amazonaws.com/batoragubukepo/zitonuwafudadotigosu.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/mystery_message_math_worksheet_12.6_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1731/2152/files/the_bell_company.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/al_ghazali_books_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/outboards_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/sewing_brother_machine_ls2400_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/41636930540.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/vivid_seats_vs_stubhub_vs_ticketmaster.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/dr_oz_garcinia_cambogia_dosage.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/pokemon_xy_3ds_emulator_download.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/social_media_content_calendar_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/xikufiwelokamusuzijiseta.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_off00004a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A5A 5340 bytes
SHA-256: b159628dfc137151f05e69ef69de2d90061ecede924af7ec58580095965b2622
font_01_sfnt_off00005c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5A 10364 bytes
SHA-256: 9e5301a92dada938d4afd9b25813a40163525ab2fea01ddd3c4e2b68d0332560
font_02_sfnt_off00007fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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