Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9aae51915f5523…

MALICIOUS

PDF

52.5 KB Created: 2020-08-14 13:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 101b67a39039a6ea3e944152ad672a10 SHA-1: b1def27139c36e9583e3a448a527b25925bf1372 SHA-256: 0b9aae51915f55232f58f766601e359410b04ad46c582635adc043030d40d732
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate educational materials but redirect to potentially malicious sites. One such redirector is identified as ttraff.ru, which is flagged as malicious. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to drive traffic to external resources.

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/wb?keyword=exponential%20function%20worksheet%20kuta%20software
    • http://mezixot.byhre.com/uploads/1/3/1/3/131379379/1934948.pdf
    • http://files.artlynchactingcoach.com/uploads/1/3/0/8/130874063/a270c.pdf
    • http://files.goldenimprintpublications.com/uploads/1/3/1/4/131454219/lijakez.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5588/8022/files/36086356624.pdf
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/53209994869.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20785775646.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/56553537399.pdf
    • https://cdn.shopify.com/s/files/1/0441/0173/0456/files/gababesaj.pdf
    • https://cdn.shopify.com/s/files/1/0455/3284/0101/files/hsc_marksheet_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/9062745654.pdf
    • https://cdn.shopify.com/s/files/1/0450/1327/0692/files/convert_to_word_arabic_and_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/7529/6677/files/nipim.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4658/files/87206554548.pdf
    • https://cdn.shopify.com/s/files/1/0431/9313/9364/files/54094579132.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1073/files/najovoxadalolowogefixol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007650.bin
79fdbeadad204db52044c8a52c75ac3cf710a2bc4e63c0df0108076fa5b20eb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7650 4288 bytes
font_01_sfnt_off000085fa.bin
b8d68d38c0fe6e1e87a4565dfb200a09c50970e8ca57bfb8358db4a0f6e4e682		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85FA 5284 bytes
font_02_sfnt_off00009802.bin
a23f0c88d733aa68b17b4e4c7caa79a2e59c5cb5847df11e89379c42d1e95bad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9802 14280 bytes

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