Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc924e5a11bd5450…

MALICIOUS

PDF

48.3 KB Created: 2020-09-04 15:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 337b3b5b5cd5aae09a7618041efa3f0a SHA-1: 60c0acd9db4ef3a77ebd8298cc1daf8074bbddf6 SHA-256: bc924e5a11bd5450e5162c414cfbb8b2bfcbd1799e72865e22ee64f0c0221327
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to a redirector infrastructure. The primary heuristic indicates a malicious redirector link, and the document body, though heavily obfuscated, contains a URL that appears to be part of a lure. The ML classifier strongly supports the malicious nature of this PDF.

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.link/wix?keyword=fire+emblem+echoes+fear+mountain+guide
    • https://static.usrfiles.com/ugd/99965f_c3c7650a886448c78c3d1d4eb911d51d.pdf
    • https://static.usrfiles.com/ugd/73c254_9addf4abd86640f4a740c0f867bfb568.pdf
    • https://static.usrfiles.com/ugd/1c8c1e_4130c87cd5444e909688af2caee3e856.pdf
    • https://static.usrfiles.com/ugd/67e251_2ce8b8d49a3e4a0c9d6829deac565c91.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_30b7396554de4d958a0b46d108a39d5e.pdf
    • https://static.usrfiles.com/ugd/77941b_0b2c43bf0d0a46dab3d3305e0c599dc0.pdf
    • https://static.usrfiles.com/ugd/c3548c_3071310cdca5447e9e06a074ca485d17.pdf
    • https://static.usrfiles.com/ugd/b09e1d_7b0d917628d24a7d9f5e89e215ed4664.pdf
    • https://static.usrfiles.com/ugd/2274a7_b2087a5b87e64aa5a2b33b3a20e2533f.pdf
    • https://static.usrfiles.com/ugd/217d68_70a37e9860034bc1b6f26110b696520f.pdf
    • https://cdn.shopify.com/s/files/1/0428/5012/3943/files/88722128920.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3850/files/ardamax_keylogger_5._0.pdf
    • https://cdn.shopify.com/s/files/1/0432/0234/7168/files/13648844188.pdf
    • https://cdn.shopify.com/s/files/1/0440/0542/5310/files/35181678466.pdf
    • https://cdn.shopify.com/s/files/1/0465/0536/1566/files/25605144060.pdf
    • https://static.usrfiles.com/ugd/f64db8_163fe72f84614ca0a24731bef1299322.pdf
    • https://static.usrfiles.com/ugd/1849a1_cd311fffc9e743aca9cfd8d354a0d984.pdf
    • https://static.usrfiles.com/ugd/97493d_defb2794fee34ce3846be92988e9aab0.pdf
    • https://static.usrfiles.com/ugd/e73fea_ebb61d2957d24d32b46e3a6fedeeefaf.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_92ae21bac24b4d33aa6167eaec57c403.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_off00007e4e.bin
b160e0a69715ec9d8e662f027a2ca938ad2783049dda33f1dfbad5000079d8ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4E 5528 bytes
font_01_sfnt_off000090ea.bin
027d38974b8ab450af02134732006868360dc4a26417961d1e830d2f27a6b2ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90EA 10092 bytes

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