Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f2c6f2f372c0e1…

MALICIOUS

PDF

40.6 KB Created: 2020-11-03 12:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e92cf7aec53ab602369cce6dcb5de470 SHA-1: 84428e0d57e970c03cf7de266ed2f775eccf8b4e SHA-256: 40f2c6f2f372c0e1c471bf066610a9b343412db4094207b1393e55b380986425
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to lead the user to a compromised site. The document body, though partially obfuscated, contains the text 'On my hp computer how to change password' and the malicious URL, suggesting a social engineering lure. The presence of numerous embedded links, many pointing to S3 buckets with seemingly benign filenames, is characteristic of SEO poisoning or link farm tactics to obscure the malicious redirector.

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/aws?keyword=on+my+hp+computer+how+to+change+password In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mukutud/indiana_license_plate_lookup.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/hydraulic_accumulator_design.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/endometritis_treatment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e2ddea-7f00-46b6-a713-5ac365bb6564/96463893571.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/spotify_premium_apk_download_offline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3078/9794/files/self_car_wash_near_me_coin_operated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c495d08-7e61-4a02-b709-715b18b3ce81/dd_1e_players_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338d0bf0-2b93-4b0e-be66-41ff74a44ccd/wesumiruxidokotanatakuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8872cda-3362-4a27-b14a-2c0001faf015/jusamapegadikimatawel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b93161-549e-40b3-beca-c190111f488b/tangled_full_movie_in_hindi_mp4movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704c3da4-32e1-40a6-b93d-8030bbfe4630/41494142208.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_off00005edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDB 5676 bytes
SHA-256: f9c0b7ae8f3ed34485ee29a2c39e95f697af32e3a3b991050e37eeddff777156
font_01_sfnt_off00007212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7212 10456 bytes
SHA-256: a42156bf086ec1c9daa047955931d2567b644ee15fea2193a34a57d05432c86f

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