Malicious PDF — malware analysis report

Static analysis result for SHA-256 36567f318e00e922…

MALICIOUS

PDF

40.5 KB Created: 2020-08-24 12:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23feb7f7f67320d64aa1ba93d08eea42 SHA-1: 33b2b7b4a6b62c1a9db46d000c6fb90fed742ee2 SHA-256: 36567f318e00e9220b38a8141102c33b32ddb5fd910665c72db3307d55733ed4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm pointing to multiple Shopify-hosted PDFs, with one primary link to a malicious redirector. The document body, though heavily obfuscated, contains the text 'Native american cultures worksheet answers' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a 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.com/pify?keyword=native+american+cultures+worksheet+answers
    • http://files.bhbrilliantminds.org/uploads/1/3/1/3/131378942/4f655f993b86a.pdf
    • https://cdn.shopify.com/s/files/1/0433/4505/1797/files/jefatuxeseji.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/69326732787.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7894/files/rockstar_social_club_sign_in.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7820/files/mathematical_excursions_aufmann_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0639/files/4023530666.pdf
    • https://cdn.shopify.com/s/files/1/0440/9645/4808/files/rujumosaxowobe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6741/files/95591404210.pdf
    • https://cdn.shopify.com/s/files/1/0432/2652/9956/files/mewabotenuvumavalug.pdf
    • https://cdn.shopify.com/s/files/1/0432/2466/2173/files/11000691719.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3820/files/bohr_atomic_model_postulates.pdf
    • https://cdn.shopify.com/s/files/1/0437/9597/2256/files/nupevasopuzipifisoza.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_off00006204.bin
31a48bd154da3dae5af422ed1dfb83e92398241f989509a1120e21586c524a42
pdf-font-stream PDF embedded font (sfnt) at offset 0x6204 5224 bytes
font_01_sfnt_off000073b2.bin
251dd554b9a3c9103016bdb5732d841221916dbdc7e6c285708c00c2d3f381ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x73B2 9884 bytes