Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4111c253601a236…

MALICIOUS

PDF

57.9 KB Created: 2020-11-02 17:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 903caefa6670f2b11ce7e9356631a0bc SHA-1: 5378d4face59b74253a39e7f5b950af9edb2509f SHA-256: b4111c253601a2365fb9075862e6cfcf3382d5760b18ecd5842243026b685f09
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is likely intended to deliver a secondary payload. The document body, though heavily obfuscated, contains the same URL, suggesting a social engineering attempt to trick the user into downloading a file. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=dcs+black+shark+2+manual+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_5f90d668af72f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0230/3893/files/definicion_de_composicion_musical.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8486/6245/files/3f_ul_gear_tent_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d1c5ea-5f83-4e6a-ab71-6962c206a050/gofetoxeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/841db9e1-fcfe-43b6-9ed1-a675f5997665/ziboxetig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7720fe-c956-4afc-9888-f332cdd91cb4/chinese_porcelain_marks_two_blue_circles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9514/6139/files/25178048148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7e446f-b4e9-45d3-919f-68bfde91a71e/vudejijupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/556d291d-eab9-4109-b82c-731778cd3963/fugidedajolevoro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/6259/1387/files/zugosebulotaposefubofudir.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_off0000674a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x674A 18392 bytes
SHA-256: 4eaa86339871406f15631bf92bf9a7cbd84e3c1d7d293f9afa8d836643a6fa2b
font_01_sfnt_off0000a26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA26A 5608 bytes
SHA-256: 58fbdda3d8ae842e3486d2b600d003f6c6b9499c2a3396d2417912e88ad001b1
font_02_sfnt_off0000b561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB561 10996 bytes
SHA-256: d4efcf7de86219d507a962f0475b143d73d301020e84830318ec66bf853d333a