Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02476b757677ef1…

MALICIOUS

PDF

42.7 KB Created: 2020-08-19 20:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4576014554e2f94dc854bad6196edf3 SHA-1: 2a41ab510e2d118641a3bc4d35c69d789b7fd108 SHA-256: b02476b757677ef16259bc99b316e84353fd5d54ced00f50c7887bd231d1ad65
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The document body suggests a 'spelling test' lure, which is a common tactic for phishing or malware delivery. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The ML classifier also strongly indicated maliciousness.

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=sa+spelling+test+blank+answer+sheet
    • http://files.foreverhereforyou.com/uploads/1/3/0/9/130969166/tefurewemowef_tisawipafimubil_ledafitetujuxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6319/7337/files/79134791228.pdf
    • https://cdn.shopify.com/s/files/1/0434/7048/7702/files/adidas_marquee_boost_performance_review_weartesters.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/93208443910.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/89022487367.pdf
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/tafoju.pdf
    • https://cdn.shopify.com/s/files/1/0448/4258/2176/files/chess_explained_the_queen_s_gambit_declined.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/mipowoxiz.pdf
    • https://cdn.shopify.com/s/files/1/0440/5483/9461/files/meaning_of_leadership_styles.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_off00005451.bin
7692953bbed84a7af12650be1f0c957536a6570be7aa198754340b4165b4dbb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5451 5480 bytes
font_01_sfnt_off000066fc.bin
aa64203557e4fa22d7caa4b5fc43f0f0fd10d8cef7adb24e6bc6c29fbe41cf5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66FC 9812 bytes
font_02_sfnt_off00007a88.bin
e78c941f2d7262d59b793b543dd3bb4b7f18f75849443946920db17903545398		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A88 10796 bytes

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