Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bc70a44e11eb7b…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 03:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ebf017a79a5edf4cef6bcb5cc128f96 SHA-1: 7fb20ca25f6291d99c63516af155d24c08298921 SHA-256: 33bc70a44e11eb7b7b9e97b2e1566e9ce0a521f14886f0475990a4f5240a9a8c
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link to 'ttraff.ru' and a large number of embedded links to other PDFs, indicative of a link farm. The ML classifier strongly supports a malicious verdict. The primary intent appears to be SEO manipulation or redirecting users to potentially harmful content, rather than direct execution of a payload from within this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=factorio+clearing+trees
    • https://static.usrfiles.com/ugd/7f929b_06c0f5ee4eb14fe2a3a175e0b85f7dce.pdf
    • https://static.usrfiles.com/ugd/fac845_2e0c5a93a309460ab030ff67062a8648.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_8a65f9b50c734efeab7cb1ae54871f28.pdf
    • https://static.usrfiles.com/ugd/895bef_f995bbebdf114365b1cbf68e3a81ac3c.pdf
    • https://cdn.shopify.com/s/files/1/0430/3110/1603/files/putipadepeme.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/2020_buell_1125r_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3427/1126/files/supatad.pdf
    • https://cdn.shopify.com/s/files/1/0437/9030/3393/files/the_handy_forensic_science_answer_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdf
    • https://cdn.shopify.com/s/files/1/0440/4304/2966/files/perfil_de_proyecto_de_investigacion_ejemplo.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/
    • https://cdn.shopify.com/s/files/1/04

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006064.bin
84db97e3869fe6556ef9bdd3a254eda94161507c94c5f69e3218361136ffb433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6064 4712 bytes
font_01_sfnt_off00007068.bin
17682e0b0c62c13e0e3d597064bf0d71a7e05551806ab962658b411e44151c02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7068 10488 bytes
font_02_sfnt_off00009411.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9411 4324 bytes

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