Malicious PDF — malware analysis report

Static analysis result for SHA-256 683b5a143a3f117f…

MALICIOUS

PDF

48.0 KB Created: 2020-08-26 13:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d0320a128155f7f2ad0b2fb529fc4a6 SHA-1: b056b82fae4a5dd4a6882b8cd49f7a008d7f2451 SHA-256: 683b5a143a3f117fb452f59b566607ee3ac2a406d70fa68c14ce041453837917
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to external resources, forming a link farm. One prominent link, disguised with game-related text, redirects to a malicious URL identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. This suggests an attempt to trick users into visiting a potentially harmful site, likely for phishing or malware distribution.

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=counter+strike+nexon+zombies
    • http://files.natjacobs.co.uk/uploads/1/3/0/7/130740049/vifepozewabasut.pdf
    • http://files.legaladvice2u.co.uk/uploads/1/3/1/4/131455832/170540.pdf
    • http://files.bestoftimeswatch.com/uploads/1/3/1/3/131379749/e4facd24be.pdf
    • http://sonuwa.sonyaparra.com/uploads/1/3/0/7/130775478/burunazabizosukaxiv.pdf
    • http://files.speaktruth1.com/uploads/1/3/1/3/131384025/suzeza_golekawixezoz_subikidu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1073/4755/files/control_system_engineering_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/3508/0342/files/2493738522.pdf
    • https://cdn.shopify.com/s/files/1/0463/3742/5564/files/11390731732.pdf
    • https://cdn.shopify.com/s/files/1/0431/0469/8534/files/fractions_decimals_and_percentages_worksheet_tes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4485/files/nazikazi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6773/4171/files/allison_mt643_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/7187/1912/files/55868977072.pdf
    • https://cdn.shopify.com/s/files/1/0430/7196/3296/files/87413157313.pdf
    • https://cdn.shopify.com/s/files/1/0434/8539/7152/files/nozijivep.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/48058645815.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2109/files/fowapetosejusokese.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000662f.bin
cddd408e3bb03edb4df60829163063f4f47d93c2e0be99048a5a401ce964b567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662F 4816 bytes
font_01_sfnt_off00007680.bin
5bbe750b22fee790abb9c8b3d9fbcefd52d3606bc72ba1f5830edaf99ba9abb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7680 12112 bytes
font_02_sfnt_off00009dac.bin
afd6d0fa7873fccffa13b10c9b1649aecd825fe62c5a34a5a0188d37c1579bbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DAC 16212 bytes

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