Malicious PDF — malware analysis report

Static analysis result for SHA-256 176c86b10e6ec24e…

MALICIOUS

PDF

75.8 KB Created: 2020-08-25 01:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5977a333a7e079ba7fb92cfd5e005747 SHA-1: eb4882e1ace1e16bdee09faca05eaa75b5891da1 SHA-256: 176c86b10e6ec24e79dcfcace736420d0d5843aa801482fc3b331919834c2c3c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure (ttraff.cc). The document body, though heavily obfuscated, appears to mimic search results for educational content, suggesting a lure to trick users into clicking the malicious link. 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=7th+grade+advanced+math+textbook+answers
    • http://files.trader-lee.com/uploads/1/3/1/0/131070351/mofupebasemesedula.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4247/9007/files/44242356712.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5567/files/95883719931.pdf
    • https://cdn.shopify.com/s/files/1/0439/5306/2043/files/xifukoda.pdf
    • https://cdn.shopify.com/s/files/1/0438/6432/6309/files/banadinenokobibadaro.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/duganoveveri.pdf
    • https://cdn.shopify.com/s/files/1/0434/1579/7917/files/wopunujib.pdf
    • https://cdn.shopify.com/s/files/1/0431/1914/9216/files/puponaminemimewapisubiga.pdf
    • https://cdn.shopify.com/s/files/1/0438/4768/0162/files/goribiduwobasebotiga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdf
    • https://cdn.shopify.com/s/files/1/0438/2166/2365/files/adobe_premiere_elements_11.pdf
    • https://cdn.shopify.com/s/files/1/0438/6013/2005/files/2574128724.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_off0000d2d1.bin
fb415f96d0811511c89385590f139ce8a358ac1b10c7afd1e861ab687ea689a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 5728 bytes
font_01_sfnt_off0000e63e.bin
27398261f0c4c887176f1b0e98aff9aa53728c6714bd3ed46e7bf88ee7b17715
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 11080 bytes
font_02_sfnt_off00010c19.bin
f3b95f1269985bafc3dfb9b5b35e76df8a4d57039a143c013aed99c7cf3a4a89
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C19 16344 bytes