Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8920eafc9c93b5…

MALICIOUS

PDF

46.1 KB Created: 2020-09-07 01:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00443369482d2671a8ca8f983e336c3e SHA-1: 77b3de4b91a946d994f6746b93403fadbf6708fd SHA-256: 3f8920eafc9c93b57547b048b6d0733b41c57a935566cabc1dda9bcc193cbdab
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, disguised as a CIS benchmark for Windows 10. This is a common social engineering tactic to trick users into visiting malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded links are highly suspicious.

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.club/wix?keyword=cis+benchmark+windows+10
    • https://cdn.shopify.com/s/files/1/0434/0717/9941/files/90495270825.pdf
    • https://cdn.shopify.com/s/files/1/0436/9999/4778/files/kajedejijijiweril.pdf
    • https://cdn.shopify.com/s/files/1/0432/4157/0466/files/jadazabisezaluzeleguka.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/19339037681.pdf
    • https://cdn.shopify.com/s/files/1/0438/6878/2757/files/mozofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/67565849615.pdf
    • https://cdn.shopify.com/s/files/1/0431/2327/7973/files/43866183811.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/97248581454.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/magogitalitepinukeg.pdf
    • https://static.usrfiles.com/ugd/38bf1f_9e38d765945749a5bde9bf46667de488.pdf
    • https://static.usrfiles.com/ugd/7c3584_83baaa4dca4c419595b38ba7f0998c4b.pdf
    • https://static.usrfiles.com/ugd/f0e51d_6fbc2b690ae94706a736c237262e23c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_93fb442f601d4f1396acf8fe3e42e002.pdf
    • https://cdn.shopify.com/s/files/1/0431/1285/7754/files/d_d_all_classes.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/casting_defects_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/7570/6788/files/bodokadenakefezuxa.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_off00006b23.bin
0aff2dc1c43d62c4ddb38c4d683a309dc7efdad693f603ac0243fcf246d95328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B23 5540 bytes
font_01_sfnt_off00007dd8.bin
581594d6c2eb06516a3f3504fda84ddf607523b9659fa4d66f638677a83c571b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD8 14604 bytes

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