Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ca51de57e0583e…

MALICIOUS

PDF

107.6 KB Created: 2020-08-05 09:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bb237b4a77a9cfb7d51bd8373d8be19 SHA-1: 05c682cec0e67f7ef36d7983a1a8288e0acd32d7 SHA-256: 63ca51de57e0583e0c508876cdb90c2851a2bf488305e9930eeab60e224dee22
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that mirrors the one flagged by the heuristic, suggesting a phishing or scam attempt disguised as study material. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=sap+basis+full+study+material+pdf
    • http://files.brasserielouloudi.com/uploads/1/3/1/4/131437474/2096263.pdf
    • http://files.lightenupwithliz.com/uploads/1/3/1/4/131483098/4cc41b189ebf5d.pdf
    • http://mamuwuxex.journeytobalance.net/uploads/1/3/0/9/130969472/97f986.pdf
    • http://files.iananthonycoleman.com/uploads/1/3/0/7/130776718/9342694.pdf
    • http://files.trevorstamp.com/uploads/1/3/1/6/131606101/dotituzo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/5287/4390/files/76797889277.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/dofujufuroxer.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0436/5022/0185/files/82090931236.pdf
    • https://cdn.shopify.com/s/files/1/0428/6890/0006/files/75887073345.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8985/files/kalizaxodi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/zizelebivojefubowumegok.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/95462335453.pdf
    • https://cdn.shopify.com/s/files/1/0438/7838/3771/files/marketing_analyst_resume.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nefodegaxinavikiva.pdf
    • https://cdn.shopify.com/s/files/1/0434/2897/0647/files/benjamin_franklin_biography_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99839510681.pdf
    • https://cdn.shopify.com/s/files/1/0437/4482/1399/files/ranakixopef.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015a67.bin
0e8170df3212ec00de267a7fd98e8c9e83d3d31c10362e1f013a6d72787cd66a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A67 5532 bytes
font_01_sfnt_off00016d22.bin
f4f139939a6142a2668f69a4bc2bc752d7c92d3fa97766ca5236ede94d0a3857		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D22 16120 bytes

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