Malicious PDF — malware analysis report

Static analysis result for SHA-256 734300da1f4b2a37…

MALICIOUS

PDF

48.8 KB Created: 2020-08-30 06:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfff02fe2d0cd61bb4e3bab09b0376d8 SHA-1: 7622c9c74d47044af485f2f8c51b53ddf811d28d SHA-256: 734300da1f4b2a37b0a08fb67feee2dad95c9613a98d4e57cf82a082af4012c8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector infrastructure, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to disguise malicious intent. The presence of numerous other PDF links further indicates a link farm designed for SEO manipulation, likely to increase the visibility of the malicious redirector.

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/wix?keyword=just+listen+sarah+dessen+pdf+full+book
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0df15e_8a780abd5708494393a4111319ba7c76.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ae7500b4a6e419fb4371d4f923e6e19.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb7ad4ebf02746cc8174d374af71a4a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4f7ac90e6dd4d6b9195487a5d661922.pdf
    • https://cdn.shopify.com/s/files/1/0430/9375/4009/files/vavanutibo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1437/9930/files/chuyn_file_nh_sang_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1673/files/company_secretary_application_form_2019.pdf
    • https://static.usrfiles.com/ugd/b8c837_5efa5754b4034f06a5226a533c3911f5.pdf
    • https://static.usrfiles.com/ugd/2b25b5_f4d1c7f6aad54833ac64ce8a888d2686.pdf
    • https://static.usrfiles.com/ugd/01e791_ff43e951619c4dd196031c31716fc520.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/25546630205.pdf
    • https://cdn.shopify.com/s/files/1/0436/4782/8133/files/81464755473.pdf
    • https://cdn.shopify.com/s/files/1/0437/6897/1418/files/bsphcl_je_2020_notification.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3661/files/xitusowutisurasumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/41173245683.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006813.bin
597987b334f6484ecc3e0b2f3fa2481af5db19045449cd98787b225b9df80888		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6813 5324 bytes
font_01_sfnt_off00007a14.bin
51b28ecf7ea3d36b538f6c829f5e7d4899ecbeeaf1d7017e6301f14f6925bf7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A14 10848 bytes
font_02_sfnt_off00009e8d.bin
0428fc5ed25e584978f484c011ffef10e2100e84540c1e3d44192ef5efd951c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E8D 16344 bytes

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