Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c70fe0ed54e8e94…

MALICIOUS

PDF

69.2 KB Created: 2020-12-16 23:35:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d5d21bb9b1e93cfa364a26fc9e878f6c SHA-1: 1d2585a4a2e3612ad24c2c262fea2bf34e66101c SHA-256: 1c70fe0ed54e8e9482b4edfc684b0f0aa2744fd4416b0b62468f95b90f8a4ac2
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/aws?utm_term=physics+textbook+application'. Additionally, a ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'Physics textbook application'. The primary attack pattern involves redirecting the user to a potentially harmful external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=physics+textbook+application In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5fc6913aad421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452169/normal_5fad86bd485e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486743/normal_5fa923f0b3964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5fa891afb252f.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/dutuzanob/mimsie_the_cat_cause_of_death.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/candy_em_word.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/download_jaycut_for_chromebook.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/zunupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54aaaf5b-2b9d-454d-bc55-4cbd01ba06b4/45031039126.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/pandora_one_patched_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/define_toddlerhood.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/47784710817.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/12034150649.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/google_docs_spreadsheet_api.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/anger_crossword_puzzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/banozaxosikudomav.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_off0000d016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD016 5300 bytes
SHA-256: 4c1f2e64f2edc9b701cd20d24b3d7295725003d28d51baf321d68408090be82a
font_01_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 10888 bytes
SHA-256: 74713b3294b46445df164225f2049a7437c3e5ecb5207fa85b6435844204459c

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