Malicious PDF — malware analysis report

Static analysis result for SHA-256 8722fc6490b91f8c…

MALICIOUS

PDF

70.2 KB Created: 2020-12-20 10:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fca02d7b2fdc54c8ac0f12db57b1c7a3 SHA-1: 85c35b3bc0ffd05f28e9341c72f090bed934f786 SHA-256: 8722fc6490b91f8c168dec08ac7ae1e6626298d3f2dc6fe2161a9a207026c4da
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector and a link farm. The primary URL leads to a known malicious redirector, and another embedded URL points to a PDF that is likely part of a larger SEO spam campaign. The document body, though heavily obfuscated, contains text related to a game, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?utm_term=draw+a+snowman+with+your+eyes+closed+game In PDF document text
    • https://nanarazoru.weebly.com/uploads/1/3/4/8/134859944/soditabasixipow-malugelitus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480397/normal_5fbcf4c783e66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482219/normal_5fb292ec53d4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5fd2702a6d4b1.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/kujabes.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/30a199f2-26a5-4991-bf96-83dbff2cb772/advanced_financial_accounting_textbook.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe18943485235c868d4e8e/1606293670526/yu_gi_oh_pro_2_apk_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58b5a085bf90c0e1ca2e1/t/5fc8b201f97c193540f5e56a/1606988291032/history_of_japanese_written_language.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f252e5c7695ca99bde90/t/5fc9ad601a258d244fdb2a00/1607052640867/never_have_i_ever_questions_extreme_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45fc80e-7d4e-4aa2-b89f-011d8d9001e3/promotora_de_salud_sakura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36409087-a33e-4de0-8fd0-ff7fcc93b491/zenob.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58165f7cf8c754049f2ca/t/5fd6f3d23ebe04163174d5f0/1607922643585/transformers_robots_in_disguise.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_off0000cc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1F 5544 bytes
SHA-256: 6ed0bfbff44f7a0e7d6d428ef79e9cfa854c481991215fc567e040e6d49a40d8
font_01_sfnt_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 10636 bytes
SHA-256: b8619d012fa7ee8536a100b0dff0a2a79f9b7b6422133afe902bfc8bbe1e9afb

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