Malicious PDF — malware analysis report

Static analysis result for SHA-256 398d1f4d695394ec…

MALICIOUS

PDF

43.1 KB Created: 2020-08-30 22:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebfd2378f44f58c2c2b785b8dccd3b9f SHA-1: 984a6843763328a36b8bee0934af883fed8092f8 SHA-256: 398d1f4d695394ec70973e26c2c14cbea7d1e4aa7567961c223458ecabec9fa1
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure disguised as a guide. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect 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.club/wix?keyword=miami+peacock+bass+guide
    • https://cdn.shopify.com/s/files/1/0436/1990/9794/files/35776597616.pdf
    • https://cdn.shopify.com/s/files/1/0454/2994/8572/files/66298866662.pdf
    • https://cdn.shopify.com/s/files/1/0436/3275/4841/files/goragezasubip.pdf
    • https://cdn.shopify.com/s/files/1/0431/6787/5221/files/c_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0445/7873/4239/files/9878590215.pdf
    • https://static.usrfiles.com/ugd/ace02d_e5ec3842a3e942a9b97f2e3c2f77bb6c.pdf
    • https://static.usrfiles.com/ugd/9a242c_9786c4ca66af4bc395f68e9f2fbdff3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_559675a73b904d7ba612f4eb3e05f2b7.pdf
    • https://static.usrfiles.com/ugd/6f7357_b03bc2925a25405ca00e60eaffb778af.pdf
    • https://static.usrfiles.com/ugd/eaf48f_3f9237ff427145ef91ae85df2c0aa72f.pdf
    • https://cdn.shopify.com/s/files/1/0433/9541/6213/files/rs3_1-99_fishing_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/if_statements_in_excel_multiple_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9319/files/fulamedorolem.pdf
    • https://cdn.shopify.com/s/files/1/0431/8396/4324/files/ragafunulifikuno.pdf
    • https://static.usrfiles.com/ugd/6908d7_880d0ab1fc3f45b28fcd616f6fae43a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d79f086051b493cac22bfa2ce73769c.pdf
    • https://static.usrfiles.com/ugd/b80405_d766cc33e6734a51b93b7a47ed69cc8b.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_c7e3591112fb4f60afc4e24999a45efa.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_off0000691f.bin
f5322c8985975422f4796afaba969f8160059c9cec9e069a5422a1cde488b25f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691F 5472 bytes
font_01_sfnt_off00007ba9.bin
904ddc8583b81bb44bfbe6b98ef58a88677597a488537da0e365e899bcd6065c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA9 10444 bytes

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