Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c0d76ad9250ef2…

MALICIOUS

PDF

45.9 KB Created: 2020-10-29 01:11:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e2c2d737a12e66b512c83acd9501751a SHA-1: db4701805fc696a7af3184f2e7627191076761f7 SHA-256: c4c0d76ad9250ef26789a918fe25fdadb5dfc56662f61954d0594f4d5f19524e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ttraff.cc/123?keyword=ready+by+21+conference+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f9682fd44cd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5f9007c27e0e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5f9066845ec77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5f93f7d028add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_5f8d4948d0ae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f874376599ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_5f8f725c92b10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_5f97b84225389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_5f9695acbd31f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_5f9051214d7c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/rakuwowuwugawiludoma.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/15381217557.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8939/0487/files/rory_storm_and_the_hurricanes.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/37132679229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a97f36-c2bb-4512-9c5b-bc805743b4da/apple_ipod_touch_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4532/9832/files/the_jump_manual_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e174932-b053-47d6-b5d6-b774cd743f1f/dorikisadu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7488/6043/files/gaxatasobonupukepezonofe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2360/5153/files/64440997573.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/99594902946.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3826/8318/files/wps_office_manual_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5296/4266/files/volilagofaku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8916/1128/files/complete_digital_photography_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4156/9947/files/share_it_apk_android_5.1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3332/9815/files/47720041453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a02ca97-73dd-4232-b244-f52492b2c529/7239776652.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0935/1585/files/the_watch_repairers_manual_second_edition.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_off0000723e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723E 5380 bytes
SHA-256: c7b3cfe7e19c795aeb2139a2a635b50cbbcdf648dbd911560a7117d20061329c
font_01_sfnt_off000084ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84AB 11536 bytes
SHA-256: 1c0a7271b5ab6f88edbd517012c7875f06165e1b62b685bd3f88673377ed5329