Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b9b758dc589a87…

MALICIOUS

PDF

51.3 KB Created: 2020-08-03 19:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09798438fe9cdece408bda3cf7958586 SHA-1: 7123e8efb20dc18f38dab242af5b5a6b353bc59b SHA-256: 20b9b758dc589a87e12e934cb37d27a58a81da0531c4f52eb404f4c0ad06d33e
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify. The document body, though heavily obfuscated, contains text related to 'environmental chemistry class 11 ncert notes pdf download' and the malicious URL, suggesting a lure to trick users into visiting potentially harmful sites. The ML classifier 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.ru/pify?keyword=environmental+chemistry+class+11+ncert+notes+pdf+download
    • http://files.traceyknapp.com/uploads/1/3/1/6/131637374/meximu_nokibidilog_zalirezetuset_salemorazojeson.pdf
    • http://files.learningandbehavior.org/uploads/1/3/1/4/131409526/juvatizorajame.pdf
    • http://files.taotantricteachers.com/uploads/1/3/1/4/131455680/2562728.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/mafogujebubijolenu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2891/files/xakisobibululafikuxep.pdf
    • https://cdn.shopify.com/s/files/1/0437/5209/5898/files/xinexibek.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/nikujibimaxuvu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2208/8354/files/22312749903.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/73138055257.pdf
    • https://cdn.shopify.com/s/files/1/0437/5281/6798/files/48265690726.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/29694157490.pdf
    • https://cdn.shopify.com/s/files/1/0436/1139/0115/files/famexeza.pdf
    • https://cdn.shopify.com/s/files/1/0437/4868/8033/files/sedexepeteno.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/xefataj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/sinemebegexivinidizigebes.pdf
    • https://cdn.shopify.com/s/files/1/0428/4963/2415/files/tafoduva.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_off000073ff.bin
54135b2f11f83cc90fe4208f6081d4a4a8d175c913fa901be654a6253bb2fd06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FF 5660 bytes
font_01_sfnt_off00008735.bin
6b10c388ca8fcb9c7770d455b492b8ac7a10a6038ee05fb1d0001f23969b1bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8735 10268 bytes
font_02_sfnt_off0000aa65.bin
63a83331b5e33638d2884a48cc841bf0283b21584b64ebb309d6b018ca2e567a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA65 16096 bytes

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