Malicious PDF — malware analysis report

Static analysis result for SHA-256 26750f481481348a…

MALICIOUS

PDF

42.0 KB Created: 2020-08-12 06:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39bb83652904161d3e1a38ceda800fbf SHA-1: f08ed4950cd72f72e9a3742f18d56995b62636dd SHA-256: 26750f481481348a1dcaaf73c88f8368a5bd536783f4db215e1e0fcc9d4f0010
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=educational+research+quantitative+qualitative+and+mixed+approaches+pdf+free', leads to a link farm of numerous PDFs hosted on Shopify, many of which are benign but serve to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.cc/pify?keyword=educational+research+quantitative+qualitative+and+mixed+approaches+pdf+free
    • http://ludur.estefancy.com/uploads/1/3/2/6/132683056/1322135.pdf
    • http://files.christmaslunches.co.uk/uploads/1/3/1/4/131407424/41de80.pdf
    • http://files.rainydayrevival.com/uploads/1/3/1/3/131398094/4cf39dfe5413.pdf
    • http://files.sandiego-ymf.org/uploads/1/3/1/4/131437878/558146.pdf
    • http://files.mainetwpadultlearning.com/uploads/1/3/2/3/132302993/misefolodigukat_zikufekave_mejubapuxumur_tenirofamurul.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/sipuwumidalutirimuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/0428/0481/files/savoliwowi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/sijekobenesitebaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4405/2885/files/convert_to_editable_word_free_online.pdf
    • https://cdn.shopify.com/s/files/1/0438/8500/2920/files/sufipowidunisirameropap.pdf
    • https://cdn.shopify.com/s/files/1/0440/7122/3446/files/generalized_anxiety_disorder_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/116664145.pdf
    • https://cdn.shopify.com/s/files/1/0437/6133/6471/files/intermezzo_cavalleria_rusticana_string_quartet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7786/9476/files/purududugiwewovoneturam.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/wonopipitilunusoju.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/classification_of_vowels_and_consonants.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057fe.bin
efc48bda9069c599407148fa237c314ea5675075e7b2c2f89672d57d6c40b21f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57FE 5604 bytes
font_01_sfnt_off00006ae7.bin
4ed53709e9ad09cfed9b2bced401d6067fbee45905cbf12cb3b6c7ac09846c4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE7 15416 bytes

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