Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8b1978a41dfa76…

MALICIOUS

PDF

39.1 KB Created: 2020-08-23 08:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b541224f24222650958b9efff4bc0ca4 SHA-1: 6a3236095c8cabd1aae0d3590d62a4eaf47a02c6 SHA-256: ec8b1978a41dfa76cda61d97705b8582d8f8b9ec86c5d922cf24af5662d2f435
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector at 'ttraff.ru'. This redirector is likely used to obscure the final destination, which could be a phishing page or malware download. The document body, though heavily obfuscated, contains text related to 'colors worksheets exercises pdf' and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The presence of a link farm further indicates a malicious intent to distribute malicious content.

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.ru/pify?keyword=colors+worksheets+exercises+pdf
    • http://bivuf.highwaysnhoofbeats.com/uploads/1/3/1/6/131606289/vuzuxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/77012440950.pdf
    • https://cdn.shopify.com/s/files/1/0462/6907/1511/files/rental_agreement_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2131/files/axis_mutual_fund_redemption.pdf
    • https://cdn.shopify.com/s/files/1/0432/7761/5262/files/digging_the_africanist_presence_in_american_performance.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/zulujumenegetijejafakaloj.pdf
    • https://cdn.shopify.com/s/files/1/0435/0479/5800/files/wulolasatadixu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5102/3526/files/57567891909.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sazofafusogowo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/berlin_lonely_planet.pdf
    • https://cdn.shopify.com/s/files/1/0433/3463/1579/files/75653867735.pdf
    • https://cdn.shopify.com/s/files/1/0431/2665/3077/files/powevidepib.pdf
    • https://cdn.shopify.com/s/files/1/0432/3727/7855/files/debodubukifot.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_off00005bcd.bin
deb5b46a00ac0f056850e31bb150ba4d7bbd67536649bfe90363ef77381207ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCD 5164 bytes
font_01_sfnt_off00006d6d.bin
76ea9b7882f6a69af39f849f9a9a5101150262f3c08a2e84832c6d699f87dfdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6D 10072 bytes

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