Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb249b8f90e57e49…

MALICIOUS

PDF

52.3 KB Created: 2020-08-19 06:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5a6fc3d137d622919e5adaf91e91dd3 SHA-1: e592ad75e7813585190a64166e7c381804a495f3 SHA-256: cb249b8f90e57e4912355a2b1049c7ad96a4a7e76744ce930c5f37108484728e
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains and one critical link to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body contains text related to 'guided math workstations' and includes the malicious URL, suggesting a lure to a 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.cc/pify?keyword=guided+math+workstations+3-+5
    • http://files.onpapasfarm.com/uploads/1/3/0/7/130776481/27290.pdf
    • http://files.staugustinehowell.com/uploads/1/3/0/7/130776558/6987495.pdf
    • http://files.azvrha.com/uploads/1/3/1/4/131453268/5754771.pdf
    • https://cdn.shopify.com/s/files/1/0431/6571/2535/files/stack_calculator_java.pdf
    • https://cdn.shopify.com/s/files/1/0436/2862/6080/files/firixiserobunagori.pdf
    • https://cdn.shopify.com/s/files/1/0430/8008/9760/files/wupukikejafodikax.pdf
    • https://cdn.shopify.com/s/files/1/0434/3808/0167/files/psychology_defined.pdf
    • https://cdn.shopify.com/s/files/1/0437/9826/6018/files/spm_2017_english_essay_answer.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1522/files/59921168815.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10588857949.pdf
    • https://cdn.shopify.com/s/files/1/0445/6742/9279/files/addressable_fire_alarm_system_wiring_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2813/files/cassava_flour_production.pdf
    • https://cdn.shopify.com/s/files/1/0429/5534/1977/files/barnes_and_noble_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/5425/9606/files/tirud.pdf
    • https://cdn.shopify.com/s/files/1/0439/2812/5595/files/vesadalizexekikut.pdf
    • https://cdn.shopify.com/s/files/1/0430/6957/1233/files/ruforativizarilanumaxu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075cf.bin
2f1ea6ca3d75cc14dc26ae543e802df771239a9caddf50fcf268da8a3e1342c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75CF 5424 bytes
font_01_sfnt_off00008834.bin
6d9a93779fdf3f54fda702b6e0ce807945d2c0f15de0ee98498b7ead16e22ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8834 14780 bytes
font_02_sfnt_off0000b67b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB67B 4324 bytes

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