Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ed6899ce39e4e1…

MALICIOUS

PDF

51.0 KB Created: 2020-08-31 13:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e678f49d39ba1b933ee78297587291bf SHA-1: 2681797861d0b20331754f5d43ae4012cce72eb5 SHA-256: a7ed6899ce39e4e1ea2089a04a12d8b24eb89685962b15dd54470c3216949804
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector URL. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=manual+washing+machine+diy', which is flagged as a malicious redirector. This suggests the PDF is designed to lead users to malicious websites, likely through SEO poisoning or a link farm.

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/wix?keyword=manual+washing+machine+diy
    • https://static.usrfiles.com/ugd/b8c837_65753c6de48c4181ab587ea8a8e608a2.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_6a01b5a03b8146e88678dd83737a3f1f.pdf
    • https://static.usrfiles.com/ugd/409ca8_b9571fbe70fb452aa824b855c90a6f27.pdf
    • https://static.usrfiles.com/ugd/87a178_f84dd4229564400b9212321f14396ef7.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_a70cc3deef6342908b68239c11531b47.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_c51568508a5e4fd597b44378b734b735.pdf
    • https://static.usrfiles.com/ugd/d2751c_8fd75198ee7c469bac790fe6e16a9b9f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7112932bd574c32bcf9b88ad9cab949.pdf
    • https://static.usrfiles.com/ugd/b8c837_517b4ec932634a7c88d540facb71d5c9.pdf
    • https://cdn.shopify.com/s/files/1/0434/7500/9698/files/answer_my_question_the_question_jerk.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9622/files/egyptian_cotton_fitted_sheets_queen.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/7570195472.pdf
    • https://cdn.shopify.com/s/files/1/0431/2062/3765/files/amblyrhynchus_cristatus.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9909/files/un_dia_en_la_vida_de_ivan_denisovich.pdf
    • https://cdn.shopify.com/s/files/1/0439/8641/9870/files/carrying_capacity_ecology.pdf
    • https://cdn.shopify.com/s/files/1/0432/7247/0686/files/adam_sandler_ode_to_my_car.pdf
    • https://cdn.shopify.com/s/files/1/0436/0490/2045/files/20666045766.pdf
    • https://cdn.shopify.com/s/files/1/0443/0397/4556/files/xovavobajefilifijikogu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000729c.bin
688dff421dfd00fbae4e333fccd01d568f3654ccaf7af94dd33bf05fc3794651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729C 5456 bytes
font_01_sfnt_off00008529.bin
02459f7b0328edab9cf5be18bf79ed113d27e754565e54887f0483bce0d17815		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8529 10580 bytes
font_02_sfnt_off0000a994.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA994 16204 bytes

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