Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9990bf6340c6cf…

MALICIOUS

PDF

42.5 KB Created: 2020-08-31 04:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cfd7ad25a79bb467d094ea0b63ede44 SHA-1: 647deab4e6bc102dd9738715736d0527b8932a18 SHA-256: 9b9990bf6340c6cfe5532afc9c6d1ca38183e221a9565df13e0a2327cc19e803
128 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector infrastructure, disguised as a driver download. The document body, though heavily obfuscated, contains text related to 'rtl8191s wlan adapter driver' and the URL itself, reinforcing the lure. The presence of a visual download button heuristic further supports the phishing pretext. The primary malicious IOC is the redirector URL.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/wix?keyword=rtl8191s+wlan+adapter+driver+windows+7+usb
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24803542318.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3586/files/pulse_width_modulated_dc_dc_power_converters_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0459/9798/1855/files/c_e_t_exam_information.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57148414383.pdf
    • https://cdn.shopify.com/s/files/1/0436/3943/9510/files/oxford_phonics_world_2_workbook.pdf
    • https://static.usrfiles.com/ugd/4f270c_38da0a2472924770bacb87b676c0f293.pdf
    • https://static.usrfiles.com/ugd/760101_3df8c6e6fdbb4856a38ee103dc4f04ce.pdf
    • https://static.usrfiles.com/ugd/b48b60_213dd73c62e445d18f0ccd3eaae19ae7.pdf
    • https://static.usrfiles.com/ugd/3dd68e_eaf64828ddfd4e9ca9fd14df0ca2705c.pdf
    • https://static.usrfiles.com/ugd/51c472_4719c555b9f84f26aeccf50ca12249f1.pdf
    • https://static.usrfiles.com/ugd/362633_f7fe5a4ca8264691ad5c08e65dff473e.pdf
    • https://static.usrfiles.com/ugd/a4e402_6d71c4658401420d91ca3ea4ab72160c.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_off000065a0.bin
b76feb6f1667746076dca5885a7fee90f8db4113a78acdb739b03a9de08504cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A0 5732 bytes
font_01_sfnt_off00007947.bin
eed34c6fb106e5c751fcfb0a7cdb16c522513388fa9645fd7859917247f46475		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7947 10572 bytes

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