Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0e103ef368d915…

MALICIOUS

PDF

44.5 KB Created: 2020-11-03 01:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: daebb80068b0bf23814d5016e71896ea SHA-1: 7ad48441acc6d4d6d0c678f2020d2ca7b7865cba SHA-256: ff0e103ef368d9152f24430f4cce6ba6574a8834c6f271b0bdacec0150d32f15
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://cctraff.ru/aws?keyword=q+es+exotermica'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the redirector link indicate a phishing or redirection attempt.

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=q+es+exotermica In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_5fa0696954ee8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424347/normal_5f9f2e558c48e.pdfIn PDF document text
    • https://saxuvelimeno.weebly.com/uploads/1/3/4/4/134480096/c73dcd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a2f41d-a1a7-4ef6-8180-f5a500bc79ea/ticketmaster_service_fee_coupon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3078/8268/files/2020_sertoma_chili_cook_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0467d65-61d9-4480-ad77-4fc1c24ad34c/tin_phng_iu_ting_anh_l_g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c41872-caa3-423d-834a-78e6df0644ad/5696321814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5296/4266/files/free_showbox_apk_older_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/643dbd98-cc31-45b8-8b44-4c8f635f3e2a/66812650724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d389cd-ba33-4463-9e00-060a57f06e77/vakutinevosotene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0c49aa-7760-4692-a846-db50e1062e13/9529493865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27fab638-669d-4d7c-a93f-94c051edb4ea/7558713192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcfcf2de-0ed7-43b4-a7d1-a849e046dbc5/51449373398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18fc6e1a-6112-4f8a-82af-7c3cfec8aac2/linux_command_line_compile_c_file.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_off00006e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8E 5044 bytes
SHA-256: eae8a61cfb8ab03c3d0fd34b77c0478b0589e8f672a35422bf94f77fe3d23ef3
font_01_sfnt_off00007fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA2 11520 bytes
SHA-256: 66b4e141c9e2cb946814f9f16ce1270c795dd686a04869262f2cb4ea82dfa858

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