Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adc4da45f8826b2…

MALICIOUS

PDF

74.2 KB Created: 2020-09-05 12:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e143215c64e41e489890fcfc92a76c4e SHA-1: 3c1f229a09242f86f2b35c8740d9910c1d24e8b9 SHA-256: 4adc4da45f8826b2d36177a678a1683d318fd5d0a96dbef8ae3231dc856a6ad8
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector pointing to 'https://ttraff.ru/wix?keyword=adarshalipi+book+free'. This, combined with the ML classifier flagging the PDF as malicious and the presence of a 'download button' lure, strongly suggests a phishing or scam attempt. The document body contains garbled text but also includes the malicious URL, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.ru/wix?keyword=adarshalipi+book+free In 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/1/0432/7030/7995/files/pokubup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5107/1126/files/10th_maths_guide_english_medium_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/96152486941.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9807/9399/files/vtech_manager_storio_2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4c76bf_8d198b070c8549f9b86fbcc908c81fbc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9446/4929/files/35638317201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/mofekutivateba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1400/2587/files/aditya_birla_health_insurance_hospital_list.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/978dd5_9b55e26512954c299b7d7f92b647c4d0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_afbed24747424c868d89aeb25c9ee842.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/374ce0_c97911480f33470ab83e55deb943edfe.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/79e0dc_8c839430c5394d73afdf6d8de375ce42.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d43733_93cf69233cf24f55a9fe09b31c929beb.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB659 5324 bytes
SHA-256: 19a3758230e78ba70c3991b052b5ae6302c835da83d838cc9e3d0c148040e279
font_01_sfnt_off0000c862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC862 4232 bytes
SHA-256: e64d482970f626e5992f2320819c38ce7861abb1761316c80eb75e8e8598dbca
font_02_sfnt_off0000d5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 15172 bytes
SHA-256: 56e874ee2f401609d4107e2cffeac55c4df8cb5124f1101385ba0ed4fad5526e
font_03_sfnt_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 16132 bytes
SHA-256: d9b012042df5fe8dc074c42eae0f7627b15178249d85eb70dc7afc452d134ec7

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