Malicious PDF — malware analysis report

Static analysis result for SHA-256 7566f9ae6f0d60ac…

MALICIOUS

PDF

40.3 KB Created: 2020-08-24 19:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ffd8fe0771f8dd0cbaee733121708ba SHA-1: 36bab448b322c7afcc0618d83aa6b0fbd49515a9 SHA-256: 7566f9ae6f0d60acc12a11cfcf199a244d02fffef183e8793844e003f04ee2ca
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 a redirector service. The primary malicious link, 'https://ttraff.com/pify?keyword=calculate+percentage+in+google+sheets', is designed to obscure the final destination. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm intended to drive traffic to potentially harmful sites.

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=calculate+percentage+in+google+sheets
    • http://xakup.kimberlyjamesphotography.com/uploads/1/3/1/4/131482995/8f829df8f5835.pdf
    • http://tizusi.thinknwonder.org/uploads/1/3/1/3/131380065/fidimepovidominoni.pdf
    • http://files.bigislandbowls.com/uploads/1/3/1/3/131381363/d17f8a301d0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8759/3632/files/90082970877.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.pdf
    • https://cdn.shopify.com/s/files/1/0432/8698/6908/files/duruziwozikijuvewova.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5979/files/67449458827.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/22069204531.pdf
    • https://cdn.shopify.com/s/files/1/0432/7112/7206/files/affirmation_of_faith_for_reformation_sunday.pdf
    • https://cdn.shopify.com/s/files/1/0428/9655/6191/files/reporting_agent_list_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/zogre_flesh_eaters_osrs_quick_guide.pdf
    • https://cdn.shopify.com/s/files/1/0460/1983/8119/files/stylesheet_react_native_variable.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3658/files/47012931971.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3402/files/15370306958.pdf
    • https://cdn.shopify.com/s/files/1/0428/6034/7551/files/miwasesidarotizonakuzesiw.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_off000060b9.bin
fa32b1668f59650ee1df7329edfe78f7fbb922526291893587d6d4c7c42487f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x60B9 5100 bytes
font_01_sfnt_off00007209.bin
43f3e3201f0360b10f2c141e71e4a8c1d99cbfe8671ace590148481a48dd7bca
pdf-font-stream PDF embedded font (sfnt) at offset 0x7209 10056 bytes