Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cec9f5216bfc5ec…

MALICIOUS

PDF

50.7 KB Created: 2020-08-31 11:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a085d0ac3f4db61c1c7b2c56299fe96a SHA-1: 93e78eda8d5bef6ce42722455812b3d2ce0da357 SHA-256: 5cec9f5216bfc5ec20623ba8f90d6d2fe61d183712786c9116c241aafe7ed9e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for search engine optimization, aiming to redirect users to potentially harmful 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://ttraff.ru/wix?keyword=maestras+argentinas+preguntas+y+resp
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/0c4177_dd21e9b44bab4bc6b19df5b3c42d7545.pdf
    • https://static.usrfiles.com/ugd/55cc32_15ae1b19f27e425f908ee441ae396643.pdf
    • https://static.usrfiles.com/ugd/76156b_a1d7e58c19274d33a85daaf9a14f3f0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c02035af460e4bfc92c6e51eb577c4a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0abcaceee78f4e7dbff6621253b4b752.pdf
    • https://static.usrfiles.com/ugd/225520_e62ecda85aba4b3c8ca8e10fd831131d.pdf
    • https://cdn.shopify.com/s/files/1/0429/4334/8892/files/harga_avanza_veloz_2012_manual_putih.pdf
    • https://cdn.shopify.com/s/files/1/0429/1995/2540/files/total_war_warhammer_2_chaos_legendary_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/bodenheimer_and_grumbach_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/63611828423.pdf
    • https://cdn.shopify.com/s/files/1/0439/8268/4318/files/clinical_nutrition_books_free_download.pdf
    • https://static.usrfiles.com/ugd/0adedf_fd0c8f2f1eab45bc8308ecb2e4cdbb27.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a1051f93a97403fbf82fefb01b3a263.pdf
    • https://static.usrfiles.com/ugd/455f95_1cde628c50f043e3b43e2d325032f46b.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_0895d56f43fe4a57b427773c83e4cf3f.pdf
    • https://static.usrfiles.com/ugd/ea78e0_7de809f40b184e64bd37559de067157f.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_off00007bae.bin
e2cc70158db932177ef89202f6887508dc6ee2f6cb471c3faf790490c1fde8df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAE 4836 bytes
font_01_sfnt_off00008c2d.bin
0e1ba73e119f435c348f85d33c1571ddb71cf08af34fb8e956c017779ed78722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2D 10824 bytes
font_02_sfnt_off0000af5c.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5C 4324 bytes

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