Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b9b1aa119871b3…

MALICIOUS

PDF

44.9 KB Created: 2020-08-18 12:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1baad2989fe2943058de949d66a4b3e SHA-1: e0f1dc4e52da97baeaf76befd924e7e258bb2392 SHA-256: 52b9b1aa119871b31c070d24cacee2008c549703c9b72ed9c98015e99d885119
188 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a malicious redirector link pointing to 'ttraff.ru' which is associated with phishing lures. The document body, though heavily obfuscated, contains text related to 'Equifax free credit report address', aligning with the 'SE_INVOICE_LURE' and 'SE_MFA_LURE' heuristics, suggesting a credential harvesting or phishing attempt. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm used for SEO poisoning to attract victims. The primary malicious IOC is the redirector URL.

Heuristics 6

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/pify?keyword=equifax+free+credit+report+address
    • http://files.hungrywhales.com/uploads/1/3/0/7/130776272/05c66996daa.pdf
    • http://files.stpaulscanton.org/uploads/1/3/1/8/131856086/38bcd4fa1ec2e0e.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/toefl_ibt_practice_test_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6123/files/67963542822.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/jejij.pdf
    • https://cdn.shopify.com/s/files/1/0433/4731/2789/files/37503125133.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/71373530442.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/vijala.pdf
    • https://cdn.shopify.com/s/files/1/0439/2163/7544/files/23529771626.pdf
    • https://cdn.shopify.com/s/files/1/0431/7832/8221/files/blades_of_brim_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53295895336.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0389/files/wewazejoduloginaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/7290/3585/files/lesodinebomomegetifiluguj.pdf
    • https://cdn.shopify.com/s/files/1/0436/0234/6148/files/30828196751.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_off00006577.bin
4ddbbdf42165c34f7818ff330841f9b22923d54aba8caa24313994426bc693e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6577 5044 bytes
font_01_sfnt_off000076b3.bin
b07ee8c442df2bd310bcf0399b7b31723c85dc5d152e7c80e85b1a9805ca87bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B3 9928 bytes
font_02_sfnt_off000098a0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A0 4324 bytes

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