Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2ff57fc0515c56…

MALICIOUS

PDF

48.3 KB Created: 2020-08-15 06:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10b546939aa9f94ceb94e17458889de6 SHA-1: 5f1f8cf427f007cfaff845aacb3bf9876e2491b8 SHA-256: 5a2ff57fc0515c56f023afca23d1864d6551307501adfbf023cf9d9d4b4c6d53
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain the same URL, suggesting the primary purpose is to direct the user to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=actual+cannibal+shia+labeouf+pdf
    • http://tujed.northlandfloorlaying.co.nz/uploads/1/3/0/9/130969723/lifejiro.pdf
    • http://files.sbhsaquatics.com/uploads/1/3/2/6/132682822/puwelozugipo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4402/0125/files/gusew.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8234/files/nivoku.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3866/files/fupazebope.pdf
    • https://cdn.shopify.com/s/files/1/0435/8062/0963/files/little_league_baseball_rules.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1357/files/mumojexologaxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0222/3013/files/71036069945.pdf
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/totiw.pdf
    • https://cdn.shopify.com/s/files/1/0437/4308/4705/files/digovategodagedibuxefeki.pdf
    • https://cdn.shopify.com/s/files/1/0432/4851/7275/files/op_sword_command.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98455436519.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/barron_s_essential_words_for_the_ielts.pdf
    • https://cdn.shopify.com/s/files/1/0441/0903/7720/files/94324914746.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_off000067e8.bin
e73db75e11720e44743204754b62165353fc3931ce864e183e92a196039e50b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x67E8 5276 bytes
font_01_sfnt_off000079ce.bin
99c77fc0b0f6b7c08201dfee1f8da1b82602025faf508f5cd1f307850518dbe2
pdf-font-stream PDF embedded font (sfnt) at offset 0x79CE 10636 bytes
font_02_sfnt_off00009e59.bin
760a9d3727253f25105bb1fc64edf994238303adea0153ebc8498db2c5f4fef1
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E59 16376 bytes