Malicious PDF — malware analysis report

Static analysis result for SHA-256 18eee530c4aba08e…

MALICIOUS

PDF

36.8 KB Created: 2020-08-03 15:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e49b367e15ac5a121fde0e4d7d8f59c7 SHA-1: 314f116aca5d653f51cd1f6334e3f69d74033993 SHA-256: 18eee530c4aba08e48eca1f01b84f57503f10f90a96be9d0b4a4e5785a6ff97a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.cc/pify?keyword=complete+physics+for+cambridge+secondary+1+workbook+answers+pdf', is flagged as a malicious redirector. The document body, though partially obfuscated, also contains this URL and other Shopify links, reinforcing the lure of finding specific PDF content. 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=complete+physics+for+cambridge+secondary+1+workbook+answers+pdf
    • http://files.oiim.net/uploads/1/3/0/7/130775346/woramepunare_dokufojuv.pdf
    • http://files.danielshar.com/uploads/1/3/1/4/131437930/bejot.pdf
    • http://files.aeea4u.org/uploads/1/3/1/6/131606666/namatipedomuxinim.pdf
    • http://files.trailbrake.net/uploads/1/3/2/6/132681880/75afce4d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tizisixurodegu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7348/4438/files/dufenoxogosudevapejege.pdf
    • https://cdn.shopify.com/s/files/1/0438/2490/6397/files/93151189911.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/how_to_craft_a_shield_in_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67142307476.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/13251960083.pdf
    • https://cdn.shopify.com/s/files/1/0433/9512/1319/files/python_map_function.pdf
    • https://cdn.shopify.com/s/files/1/0438/1445/3410/files/8152117726.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8733/files/pandas_read_sql.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ecf.bin
4851706436adb39c95552935f8874ebdd1dd4746759e8f70e609562818f8fd93
pdf-font-stream PDF embedded font (sfnt) at offset 0x4ECF 5924 bytes
font_01_sfnt_off000062e9.bin
7f8907102e3e241605e645c0aba0ae608060a1b2868f2b4f0d516e5b71f8aba5
pdf-font-stream PDF embedded font (sfnt) at offset 0x62E9 10400 bytes