Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce61770448943a1…

MALICIOUS

PDF

39.4 KB Created: 2020-08-23 02:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 018be8c59af8d210a55e7138240ad900 SHA-1: 04f6f45c68aa0feb38e4e538fc24c9cf1b9779aa SHA-256: 3ce61770448943a1df5105c6145670cf85418e4c0c67ad3261b31db240601196
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, specifically pointing to 'https://ttraff.cc/pify?keyword=fractions+into+decimals+worksheet+pdf'. This URL is presented within the document body, disguised as a worksheet. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed for SEO manipulation or to obscure the malicious redirector. 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.cc/pify?keyword=fractions+into+decimals+worksheet+pdf
    • http://files.dasoa.org/uploads/1/3/0/7/130775076/sakavup-vizibanare-vodoxofapap.pdf
    • http://files.orangegrovedance.com/uploads/1/3/2/6/132683014/1542415.pdf
    • https://cdn.shopify.com/s/files/1/0431/8042/5370/files/70984726311.pdf
    • https://cdn.shopify.com/s/files/1/0431/9700/5981/files/12_angry_men_study_guide_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/nurekipilifujiwugexota.pdf
    • https://cdn.shopify.com/s/files/1/0431/0394/4858/files/kaneninivaranox.pdf
    • https://cdn.shopify.com/s/files/1/0432/6323/0116/files/morgana_support_runes.pdf
    • https://cdn.shopify.com/s/files/1/0453/2790/9019/files/91373046736.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/a_breviary_of_seismic_tomography.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4651/files/93359653017.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/dituna.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1549/files/never_back_down_ost.pdf
    • https://cdn.shopify.com/s/files/1/0432/3514/7933/files/ayurvedic_dosha_quiz.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_off00005b49.bin
834c5b399a9d76c9c3c43cf4bfcccc650716287800f054529788ef25eefb8817		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B49 5508 bytes
font_01_sfnt_off00006de6.bin
f4afe7e57f062c2dddacbaad03640002036b80d961b4420377804134860834e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE6 10212 bytes

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