Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cc7500ac3e8404…

MALICIOUS

PDF

42.3 KB Created: 2020-08-30 09:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b28246d67d4c12276642dd5c605c385 SHA-1: 1a997553bef828bf6b26037e9b7281afa7cbd8a2 SHA-256: d8cc7500ac3e840494f72c12c63cafbb6123ae24cf2aae03461f6c32e70b4a7a
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/wix?keyword=grade+10+math+module+answer+key'. The document body, though heavily obfuscated, contains text suggesting it is a 'Grade 10 math module answer key', likely a lure to entice users to click the malicious link. The presence of many benign-looking links to PDF files on Shopify domains suggests a link farm used to boost search engine rankings for the malicious redirector.

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.com/wix?keyword=grade+10+math+module+answer+key
    • https://static.usrfiles.com/ugd/80c1db_ba47d38237c34158bf4c7267b9e8d504.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fe6e23ca9a04f1699d0d53e64c6856c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad0aa0217d1343d29125e7ad88f21c3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9dae9b710cb74eef81b00a83a76f1166.pdf
    • https://static.usrfiles.com/ugd/b8c837_24bc800fa5614d73aaeccb19781f70d5.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/78032863995.pdf
    • https://cdn.shopify.com/s/files/1/0457/8020/5734/files/44525666059.pdf
    • https://cdn.shopify.com/s/files/1/0435/9490/7810/files/curse_of_strahd_backgrounds.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1073/files/hernia_inguinal_cirugia.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/75705487266.pdf
    • https://cdn.shopify.com/s/files/1/0432/1850/1799/files/2009_vw_jetta_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zadolodiwifunum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000597e.bin
3b5cda911a85a6698a9bf0b0712b23df9a41a33424eb4cfaa47256e5e99db611		 pdf-font-stream PDF embedded font (sfnt) at offset 0x597E 5384 bytes
font_01_sfnt_off00006bbc.bin
bee0daab43f22563098a3a895e6415c08a86b82741a42042b8fe48414e8101e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBC 10156 bytes
font_02_sfnt_off00008e7f.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7F 4324 bytes

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