Malicious PDF — malware analysis report

Static analysis result for SHA-256 31705c7c69c80024…

MALICIOUS

PDF

60.9 KB Created: 2020-10-02 03:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 76623961439738544944bb58f955b982 SHA-1: d03337668f3a5c8a01f8d5d47c7054630125922c SHA-256: 31705c7c69c800248d213d1cf2708f97b823cdc56da25029090cc1b07551a539
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are identified as part of a link farm or redirector infrastructure. The document body, though partially corrupted, contains text related to mathematical formulas, likely a lure to disguise the malicious intent. The presence of a critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing and the ML classifier's high confidence score indicate a strong likelihood of malicious activity, likely involving the redirection of users to further malicious content.

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://ggtraff.ru/strik?keyword=sonsuz+geometrik+dizi+toplam%25C4%25B1+form%25C3%25BCl%25C3%25BC In PDF document text
    • http://badubiro.8bits4ever.com/uploads/1/3/0/7/130776225/genubomumowomes.pdfIn PDF document text
    • http://files.baagaadowekwe.com/uploads/1/3/1/4/131437119/11bf86147902.pdfIn PDF document text
    • http://files.linlinkyawhtet.com/uploads/1/3/0/7/130776489/7908300.pdfIn PDF document text
    • http://files.isstx.com/uploads/1/3/0/7/130739697/fofigimab-xosatuwen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/fuzzy_lookup_add-in_for_excel_2013.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4388/9058/files/lesson_6.2_practice_b_algebra_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/8850/4741/files/56704434975.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2656/5285/files/one_2_one_mortgage_solutions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3862/3902/files/grand_montecito_animal_hospital_boarding.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/water_heater_drain_valve_stuck.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9263/0947/files/sazulerukesujafomazaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5912/5153/files/kukotewebaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1815/6192/files/nazapunozumuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/022485fb-57a4-4065-9f6c-5a27380e04bc/melodidudurovozopejadig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa62b05-e51f-48f5-b2b6-05389cb6b8b0/11526704078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be5cc1a4-cda8-4a87-bf4e-7d5c2dbb3aed/gomov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6fb5fb4-ded3-4e56-ab67-a3f3cb1505cd/karivozosobuj.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://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_off00007bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF0 5612 bytes
SHA-256: f78f0e3fc863d1b3ece192c8d036f9cbca152f689128e476482f1946a3cf915d
font_01_sfnt_off00008eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB6 16624 bytes
SHA-256: fcbf60b7d1c17b00d197287bfbe2633a7d0c6c97ef62657c3babc9c841385388
font_02_sfnt_off0000c05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05D 16144 bytes
SHA-256: 73efa2ecda2228ad063cb30629bac9150434c1c5e5fd6e23e8a056a538b63904
font_03_sfnt_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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