Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e94e71eb574a59b…

MALICIOUS

PDF

43.3 KB Created: 2020-08-30 06:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afec00609746e87963eda94cebfd0c41 SHA-1: 7992046aeafe52f535afd0693112732247eae127 SHA-256: 8e94e71eb574a59b15eaa7234c7f67957ceea517add2a3654809c2f41a3b9463
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'simple present tense worksheet pdf grade 1' and the malicious URL. This suggests a social engineering tactic to trick users into clicking the link, leading them to potentially harmful content. The presence of a malicious redirector and a large number of external links points towards a link farm or phishing attempt.

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/wix?keyword=simple+present+tense+worksheet+pdf+grade+1
    • https://cdn.shopify.com/s/files/1/0429/0949/9548/files/academic_text_example_article.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/gilosibo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/turar.pdf
    • https://cdn.shopify.com/s/files/1/0446/2706/7043/files/ffxiv_garo_mount_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/4614/1093/files/vagofevasimejomexo.pdf
    • https://static.usrfiles.com/ugd/8cbfce_a755108761114872b59b02021546ceac.pdf
    • https://static.usrfiles.com/ugd/b8c837_ccfb870c11294a28beb93c9af028b92f.pdf
    • https://cdn.shopify.com/s/files/1/0431/8593/0402/files/90232949468.pdf
    • https://cdn.shopify.com/s/files/1/0432/5123/7032/files/xewosavenuvasuponukik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/37803324684.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/59034029354.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_off000051cf.bin
f47ad6a54a43ff202daf8d40801e9a2dc5700f2917a3c09ddaab227a4d9a8ccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51CF 5764 bytes
font_01_sfnt_off00006556.bin
c56f5fc252acdb93d754492c67cd9196c8a46faf8da41f6824ad51bf2afcdffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6556 10552 bytes
font_02_sfnt_off000089a8.bin
f72c050da1b9d2b252b60d923d48b873e3167586161433f4ccd489531a5eaa86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A8 16448 bytes

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