Malicious PDF — malware analysis report

Static analysis result for SHA-256 7288273299b38a68…

MALICIOUS

PDF

50.6 KB Created: 2020-10-25 05:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7726a28954b2d64c07bf0ce657a67143 SHA-1: 982d123b3394be8830a34bb30df4a238902bd857 SHA-256: 7288273299b38a68a79a24c32285be941420f3b4432e2dfafd20ae6f158113df
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.ru/123?keyword=installation+instructions+over+the+range+microwave+oven. The document body, though heavily obfuscated, contains this same URL, suggesting it's the primary lure. The presence of numerous other links, many pointing to benign content, indicates a potential SEO link farm or a tactic to blend malicious links with legitimate ones. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.ru/123?keyword=installation+instructions+over+the+range+microwave+oven
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/6cfa1.pdf
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/ketijalugaso_penexat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/639eadfb-1f69-48ab-8b34-a7b2de936265/50497645222.pdf
    • https://uploads.strikinglycdn.com/files/e8e4e0ab-35aa-4e05-b038-dc2350399e33/skam_season_1_episode_1_english.pdf
    • https://uploads.strikinglycdn.com/files/c3bb9b7d-90e5-4dbc-9a43-a134cfb94ac3/durazalujo.pdf
    • https://s3.amazonaws.com/jupevuxirapi/ardhanarishwara_stotram_in_telugu.pdf
    • https://s3.amazonaws.com/regovadeje/calgary_barbell_16_week_program.pdf
    • https://s3.amazonaws.com/zirojopemup/brevet_2019_sciences.pdf
    • https://s3.amazonaws.com/levovod/wegutukuzejujuza.pdf
    • https://s3.amazonaws.com/tedowafomaru/kifimafomudiwozikiro.pdf
    • https://cdn.shopify.com/s/files/1/0266/8937/2329/files/jujuronalakekopepit.pdf
    • https://cdn.shopify.com/s/files/1/0484/7645/5066/files/jewilazukezedaluwene.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/vevugik.pdf
    • https://s3.amazonaws.com/gupuso/wozavewufonam.pdf
    • https://s3.amazonaws.com/banula/27327369113.pdf
    • https://uploads.strikinglycdn.com/files/8763323b-43bb-48b0-a986-652ef17f68f0/baldurs_gate_mage.pdf
    • https://uploads.strikinglycdn.com/files/9cecc478-548c-4eea-96fa-9dac9ef64ed2/time_card_template_free_printable.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008622.bin
c01a47ba30bcb9141ae16ffa6459c6f628209d8f72b6be5a823851a14e8b9d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8622 5304 bytes
font_01_sfnt_off00009815.bin
6e98aeb14a1acc607013f6e1be5e82853b89b5f5922adabd31469509ecfaad5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9815 10764 bytes

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