Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a05b24a5ac4a86…

MALICIOUS

PDF

43.4 KB Created: 2020-08-08 05:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88d2ebd05800149095dc7144401c5402 SHA-1: 8073a5d7c07f10ec36eb8df4eadd4fd4161fb840 SHA-256: 16a05b24a5ac4a860cf86c9dcae50d047af62c036f3abc3ef0ccfe303a8aa1bd
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 link farm designed to redirect users to malicious infrastructure. The primary redirector URL identified is https://ttraff.ru/pify?keyword=mark+twain+the+celebrated+jumping+frog+of+calaveras+county+pdf. While no scripts were directly extracted, the heuristic firings indicate malicious redirection and link farming behavior, suggesting an attempt to lead users to harmful content.

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.ru/pify?keyword=mark+twain+the+celebrated+jumping+frog+of+calaveras+county+pdf
    • http://files.techmusings.me/uploads/1/3/1/4/131438389/duvugu.pdf
    • http://files.roybedard.com/uploads/1/3/2/7/132712315/77348442b.pdf
    • http://files.customerfocusedlearning.com/uploads/1/3/0/7/130738814/bavajesapamukogobos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/dizuzalefefebavuraz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/dolosupewafazox.pdf
    • https://cdn.shopify.com/s/files/1/0433/4069/3662/files/ruvapug.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7313/files/64146671826.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7138/files/reduce_file_size_macbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/96740192504.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/78738776495.pdf
    • https://cdn.shopify.com/s/files/1/0430/3260/8921/files/gibitilesarog.pdf
    • https://cdn.shopify.com/s/files/1/0432/1715/8312/files/lilimunovobuxizomafevotoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6000/files/23657475577.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/79783948259.pdf
    • https://cdn.shopify.com/s/files/1/0431/5339/1782/files/rakafolasajalub.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_off000067e3.bin
32162ebbc6ba37be8de52a440a64872e21164bfb94a3475696fe23de911dfd1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E3 6108 bytes
font_01_sfnt_off00007cb4.bin
012005499349ec05c4d45361894371dfacda00b294aeaa44a8c98a938905b32d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB4 10280 bytes

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