Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f7b6a5c60c7622…

MALICIOUS

PDF

45.2 KB Created: 2020-10-03 14:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 57d118bd90b0a014e7b470fbfc3e5c99 SHA-1: 6ebde00d78ac2eeddbcf84fb098dde6841dcb815 SHA-256: c9f7b6a5c60c7622fc2ceedb89cfa0a8757928948d3c0c3b932678a556fdc4bb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though obfuscated, contains text related to 'copy reading worksheet with answers' and a URL that appears to be part of a link farm designed to drive traffic to potentially malicious sites. 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=copy+reading+worksheet+with+answers In PDF document text
    • http://jutitoli.artyfartycanmore.com/uploads/1/3/0/9/130969707/3813551.pdfIn PDF document text
    • http://dimowolog.thefoundationwill.co.uk/uploads/1/3/0/7/130739561/bozidexax.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://uploads.strikinglycdn.com/files/4dc55e38-da83-4f9f-a5bf-23ed7e34eea7/26809116604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb7eac2-c600-4ad8-a467-caa7d05ead5c/89189630446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dbfceb5-5b0d-4837-8796-5ca41feff078/rekofejalis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1821f08d-043e-45c1-8270-6534d5930c8f/difiketo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/3325/1999/files/34125474830.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4906/6394/files/chesterfield_county_schools_human_resources.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2756/3164/files/89209398672.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9597/6853/files/leadership_theory_and_practice_8th_edition_ebook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3485/9930/files/lukovogitoviwakupewi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/7666/7542/files/generac_pressure_washer_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6816/1184/files/master_the_boards_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3156/8290/files/reglamentos_del_baloncesto_actualizado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/4515/9580/files/ethereal_plane_5e.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_off000065d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D7 5260 bytes
SHA-256: 5f0f40edbb53fd84282a3b34117a329cc847da49a2913dc31f8e8f6cdecad80a
font_01_sfnt_off000077c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77C8 9900 bytes
SHA-256: 1ad3824df9b5d82621a2d712ce8f0ee0281fb92223ae21956916c5a17b00b62f
font_02_sfnt_off0000998e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x998E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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