Malicious PDF — malware analysis report

Static analysis result for SHA-256 965065fd7f3773d7…

MALICIOUS

PDF

37.1 KB Created: 2020-08-11 21:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10c120dada25d97c509128b7ca543798 SHA-1: 2d29edfc55ca58ec2cd1a6dc43b37b4aaf2991ca SHA-256: 965065fd7f3773d704b448f51bb992bf2d68728afbdee98a82a0ef0140da82b8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'An inspector calls revision notes pdf' and the malicious URL, suggesting a lure to trick users into downloading potentially harmful content. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment of a malicious redirector attack pattern.

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=an+inspector+calls+revision+notes+pdf
    • http://files.srajohnsonspanish.com/uploads/1/3/0/8/130873947/kuputa-kimumesovikave-gafid-wajonusabugusik.pdf
    • http://dixikex.haveitallcoachsonja.com/uploads/1/3/2/6/132696194/defasabo.pdf
    • http://files.textileretreats.com.au/uploads/1/3/0/8/130814830/belar.pdf
    • http://files.memoriesofmatt.com/uploads/1/3/1/4/131454316/3238a375.pdf
    • http://files.wolfpups.org/uploads/1/3/1/4/131452823/255bfe6f760232d.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2861/files/976442716.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6727/files/dudoxusozuwexo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/fundamentals_of_python_first_programs_lambert.pdf
    • https://cdn.shopify.com/s/files/1/0437/1264/3223/files/capacitor_bank_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0440/7105/9608/files/23011411847.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/xijiwotewu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8268/files/club_penguin_hair_codes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5636/files/topological_data_analysis_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0440/5084/1750/files/xuripisudixomulofazo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3665/5259/files/npm_run_build.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9685/files/practical_management_science_4th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0439/9307/1774/files/xasanibavilubizabirimen.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005485.bin
77bff985ce681d16cf2c993985d16ea7b2ee61cb690cdd6d19aae9997d4e83db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5485 5196 bytes
font_01_sfnt_off00006636.bin
f05111b4e6647009266b528750caed74fdc51fd78f85e3b527f7e76fabac8516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6636 9668 bytes

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