Malicious PDF — malware analysis report

Static analysis result for SHA-256 70cf68b64d25131c…

MALICIOUS

PDF

43.7 KB Created: 2020-09-01 14:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 370f99af5a93b2a7f036cb22ceddfc68 SHA-1: 1efd45cd6596b75e9a774dd225f226e168601d4e SHA-256: 70cf68b64d25131cc858ae51c447f7a40174e6ec2de9ac6cd80570bf45b844d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'area of irregular shapes worksheet' and the malicious URL, suggesting a lure to disguise malicious activity. The presence of a malicious redirector indicates an attempt to lead the user to a compromised or malicious site.

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.ru/wix?keyword=area+of+irregular+shapes+worksheet+with+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/3290/1789/files/airway_management_in_maxillofacial_trauma.pdf
    • https://cdn.shopify.com/s/files/1/0431/0247/0306/files/sentence_editing_worksheets_8th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/31545968832.pdf
    • https://cdn.shopify.com/s/files/1/0432/2784/0669/files/atmel_avr_studio_6_free.pdf
    • https://static.usrfiles.com/ugd/f3cb45_826bdd6b9aad4ed88e3460ec748a70f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e8e8454c5ca4b17a035b86919f28ad0.pdf
    • https://static.usrfiles.com/ugd/3aca14_3d3c64520cba437fad8039d9d3779177.pdf
    • https://static.usrfiles.com/ugd/963627_ff3f498fa485423197b23b5c66f0406b.pdf
    • https://cdn.shopify.com/s/files/1/0437/3299/2161/files/meladugunaxowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/72504397973.pdf
    • https://static.usrfiles.com/ugd/b8c837_56d54847a64f4655a2ec39c63baa34b4.pdf
    • https://static.usrfiles.com/ugd/bf07b1_fe31a91d32684f6299a02b5594682571.pdf
    • https://static.usrfiles.com/ugd/b8c837_05f0478cb90445b1bd23fb2084d983f9.pdf
    • https://static.usrfiles.com/ugd/b47706_7bf0bba172eb44588bb25efb82b831be.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e89.bin
4875c1b92cb683064105b9e5aec1a6d133f51c7a7f73364913498191dd64c569		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E89 5188 bytes
font_01_sfnt_off0000703a.bin
1c7d8c333b69b015fc633be58e8287a46006f6946f7b43037bcd945b00256222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x703A 10264 bytes
font_02_sfnt_off00009339.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9339 4324 bytes

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