Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec76febdd2f6633…

MALICIOUS

PDF

42.7 KB Created: 2020-10-07 08:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b7823047b28efacd6552cb3d2a97d0b7 SHA-1: 9a85d08acaa226f772c86ab64fb1655d9ad2f721 SHA-256: 2ec76febdd2f6633d7c58761d9a34302f32c4a7d221b0076093f6937f1f921a3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to attract traffic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious 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://cctraff.ru/strik?keyword=vidyasagar+bani+in+bengali+pdf In PDF document text
    • http://files.crimeintelanalysis.org/uploads/1/3/1/0/131070113/piferipuvugo_mikebodid_nukuve.pdfIn PDF document text
    • http://files.theharbordivide.com/uploads/1/3/1/4/131452818/5560382.pdfIn PDF document text
    • http://files.skinperfectionnz.com/uploads/1/3/0/7/130740586/vofakix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/691e5ad2-7c0d-4344-b14d-dbf283cc1d5a/pukexedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc18008-6a6e-45d3-b873-d5d08fc34ba3/55522298410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/427e19b4-a876-4034-bc09-e063846d270c/64414511896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f01ee8-a5c2-4cd9-a61b-9ad6d05ff8e3/regazunagidesuza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2987/3318/files/54241702477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5992/7448/files/hopkins_preschool_aberdeen_wa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2240/3752/files/praise_hands_emoji_png.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5783/0293/files/fallout_4_silver_shroud_build.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6902/1089/files/how_low_can_you_go_lyrics_grease.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5662/7866/files/69289825720.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3430/3912/files/directv_genie_user_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2246/5699/files/duratuninew.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_off00006946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6946 5416 bytes
SHA-256: 38d2a0a8065612d19718e823bede69621c4c2e1b13b6a5be6a8391a2c8b38c43
font_01_sfnt_off00007bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC5 10136 bytes
SHA-256: 3dc9546065cc098b451522dcbfbecc939641da860dab5b59bb70a34af1cd43ca

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