Malicious PDF — malware analysis report

Static analysis result for SHA-256 709b62aa0af3f785…

MALICIOUS

PDF

40.2 KB Created: 2020-09-02 03:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ce049113839907e22fa23d868d4cb1e SHA-1: 6eaf48d372eca260988446fd20dcd9fb292c069d SHA-256: 709b62aa0af3f7856638f95afb63435124eb20f78ca517b1fb8642bcb698701b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a URL that is part of a link farm, suggesting an attempt to manipulate search engine results or lure users. The ML classifier also strongly flagged this PDF as malicious. The primary goal appears to be directing the user to malicious infrastructure.

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.me/wix?keyword=calcium+carbonate+davis+drug+guide+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8691/3439/files/pafimuzejivizudova.pdf
    • https://cdn.shopify.com/s/files/1/0434/1940/2405/files/chalo_telugu_full_movie_filmywap.pdf
    • https://cdn.shopify.com/s/files/1/0433/1972/2152/files/docker_run_shell_script.pdf
    • https://cdn.shopify.com/s/files/1/0472/2422/5957/files/orbital_notation_practice_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/8321/6549/files/bitcoin_trading_platform_software.pdf
    • https://static.usrfiles.com/ugd/fe0276_f08a56d143a8442fa0019b1f678062bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_831ea1ebc0e44584ac9a44771be2d06a.pdf
    • https://static.usrfiles.com/ugd/55f640_7e73020865704f5388fbcecf71bbcb04.pdf
    • https://static.usrfiles.com/ugd/b85eb0_594bdf2db44842f48d6f61e376698d3c.pdf
    • https://cdn.shopify.com/s/files/1/0440/8508/4310/files/zilejetokajomerusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/23451591423.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/68149616493.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/dapuwabazixowutikupumox.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/tuzabuwinufokisabiteza.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/banking_awareness_by_arihant_publication.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/85534958787.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/monsters_manual_5e.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_off00005ed5.bin
9f70190decc2facc5e8342e90b98f714f19c9cbc283d786ff691761a41eda216		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED5 5580 bytes
font_01_sfnt_off000071b5.bin
b0ea3b425a120191ff866c1cb427ad665495b5b3f35d90d35e51b24e7ac4605c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B5 10068 bytes

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