Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9af106e16dbc075…

MALICIOUS

PDF

47.4 KB Created: 2020-08-06 09:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d31eb55074066430bcec017ab4de0779 SHA-1: c82a42c069ab9ecdfec0374a479f5a366aa2eef5 SHA-256: b9af106e16dbc075c0d5b0c1dca894f165835b28f569efdb9d7f96c2d9140293
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to a link farm designed to manipulate search engine results. The primary malicious URL, https://ttraff.cc/pify?keyword=diploma+courses+after+10th+in+gujarat+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to educational content, suggesting a lure to entice users to click the malicious links. The ML classifier strongly indicates 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.cc/pify?keyword=diploma+courses+after+10th+in+gujarat+pdf
    • http://files.stevenleeweintraub.com/uploads/1/3/1/4/131454345/nanitepog.pdf
    • http://xozorixup.annabananaonline.com/uploads/1/3/0/7/130740044/4cadaa.pdf
    • http://files.absentlinks.com/uploads/1/3/1/4/131407530/rafawitevubel.pdf
    • http://files.studio-luxe.com/uploads/1/3/0/7/130738889/figafipa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8597/8013/files/85949214229.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6880/files/82357796913.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5061/files/nakurosikulanaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5289/1297/files/2338714636.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/99419654489.pdf
    • https://cdn.shopify.com/s/files/1/0438/1681/2706/files/how_to_crack_software.pdf
    • https://cdn.shopify.com/s/files/1/0440/6879/8614/files/39173612866.pdf
    • https://cdn.shopify.com/s/files/1/0434/9699/7030/files/watch_american_pie_online_megavideo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1090/6518/files/ielts_fever_reading_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/2004/9822/files/31206706439.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6460/files/calidad_total_ventajas_y_desventajas.pdf
    • https://cdn.shopify.com/s/files/1/0431/8534/0580/files/18168741693.pdf
    • https://cdn.shopify.com/s/files/1/0435/2373/5720/files/nuzezigi.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_off000079c6.bin
2009cb11b62050e039c483905a21853a5f1e8222d7d01005cbe770c1b92ceb38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C6 5840 bytes
font_01_sfnt_off00008d85.bin
4b9f7d57bd643551428b4afd8a485c1f3fa6eacf6da8ac62c2cb5af31c32791f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D85 10084 bytes

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