Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8add09d85630b8…

MALICIOUS

PDF

44.6 KB Created: 2020-09-02 05:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1fcca8d6606ac1d24e83230dccf5ffa SHA-1: 450139bff1691bc810eed52eedc6e8eb765dab78 SHA-256: 8d8add09d85630b8bf288f2e4a4f9adb6f261bae450ed24c3eaeaf692763c6a4
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=android+online+games+2019', is designed to lure users into clicking it. The PDF also hosts a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=android+online+games+2019
    • https://static.usrfiles.com/ugd/12dc78_c496b97737684de5bb5aa693bd561048.pdf
    • https://static.usrfiles.com/ugd/704566_6f1b68b66c904d7e8a8a8a231016cbb2.pdf
    • https://static.usrfiles.com/ugd/143c98_b1d20c57bac247a3b5865a579d639a6e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0109593593f24dd995b514e8f861c29a.pdf
    • https://static.usrfiles.com/ugd/b444d4_bbdd99613d5d42298acc28e6cfefdcb3.pdf
    • https://static.usrfiles.com/ugd/0d9a50_9ddbb25ed86843b4bd09bb3e77948184.pdf
    • https://static.usrfiles.com/ugd/9ec29b_8db31437240e45babf2b64cbd761c279.pdf
    • https://static.usrfiles.com/ugd/c8683e_27f9ba06ab474113861740f44f79c53f.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/zogivojumageperomelurezeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/pirates_of_the_caribbean_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/2204/0731/files/9029192798.pdf
    • https://cdn.shopify.com/s/files/1/0464/0522/2555/files/anabolismo_celular.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9670/files/hdfc_credit_card_closure_form_sending_address.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee0a549f8692443f815821bb22e3288c.pdf
    • https://static.usrfiles.com/ugd/9219f8_295248777ca44d53a3b19be23038000d.pdf
    • https://static.usrfiles.com/ugd/69b86f_fe9e1c49ae8a4f20aa8503d8ab47081e.pdf
    • https://static.usrfiles.com/ugd/c722c2_3260a4b52357476eb6236234494eeaaf.pdf
    • https://static.usrfiles.com/ugd/2ca09c_af706ec2e9a943019238bb94b177e144.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_off00006f3b.bin
1d5bf238edd2998c37c2671d7236bd12658376bd8728b16d449be02ef657ce86
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3B 5616 bytes
font_01_sfnt_off0000823b.bin
cf2e77058857ae817dda3dc5fcae485415feefcafd394dc268c34bbd60c0b554
pdf-font-stream PDF embedded font (sfnt) at offset 0x823B 10212 bytes