Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bc9e34dffe3f94…

MALICIOUS

PDF

53.2 KB Created: 2020-10-02 12:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fdf5d30e0d93bffe6c77e0148e1b7d12 SHA-1: 705998652ffd0159ed7ab08136556a9c74604b59 SHA-256: f8bc9e34dffe3f941196f2123ffd3d1e558674ea5829a2b4aa872c85cfb1f521
154 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to drive traffic to malicious sites. The primary malicious URL identified is https://cctraff.ru/strik?keyword=financial+accounting+bcom+1st+year+pdf, which is likely used to redirect users to a secondary malicious payload.

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=financial+accounting+bcom+1st+year+pdf In PDF document text
    • http://files.henryfusco.com/uploads/1/3/0/7/130739131/d88dfad6667e61.pdfIn PDF document text
    • http://fupeb.mississaugaquiltersguild.ca/uploads/1/3/2/7/132740399/3e255d.pdfIn PDF document text
    • https://site-1038372.mozfiles.com/files/1038372/jorokapenivenaduwesirine.pdfIn PDF document text
    • https://site-1037188.mozfiles.com/files/1037188/mekirojuvifewipufo.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9141/0596/files/made_easy_mechanical_engineering.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0202/4095/files/cashman_casino_hack_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4023/4917/files/wolf_pelt_dnd_5e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/6737/6551/files/jukosibe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1723/8688/files/runumiruwomaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0467/1646/files/menelowejonezuwifiwij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0426/3585/files/louie_giglio_indescribable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3991/8742/files/tai_chi_push_hands_championship.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7847/0817/files/finding_basic_trig_ratios_worksheet_answers_kuta_software.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6110 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off000071f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71F5 5608 bytes
SHA-256: 1878572fd663261d1a82f1584d3ba12772f6148a7a45493db136a5d3c2cee20e
font_02_sfnt_off000084ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84ED 10352 bytes
SHA-256: 8adda52f1c59d45728219c2dc7377ab5c6523fb1e3288391c1f5319aeea74d52
font_03_sfnt_off0000a859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA859 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
font_04_sfnt_off0000b658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB658 3948 bytes
SHA-256: bf79e96a7df7be6c2d30d777fe7f78d39eaeaf33e916b70b12e0febc5057387e

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