Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1935a83d96f18d…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 04:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42a33ad459aa3714ef03e8a11385910d SHA-1: df65a8368e768f668a9fd69d83a24bdc3c5f91e2 SHA-256: 8b1935a83d96f18d9d1f6c984681cbd59ab3ce6c3ecc9bb67a7141f0050a8004
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=easy+mini+cheesecakes+vanilla+wafers'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external links, many of which point to 'static.usrfiles.com'. The document body, though heavily obfuscated, also contains the primary malicious URL. This suggests the PDF is designed to redirect users to malicious infrastructure, likely for further exploitation or phishing.

Heuristics 3

  • 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.
  • 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=easy+mini+cheesecakes+vanilla+wafers
    • https://static.usrfiles.com/ugd/e8506d_dc3e0029d55f455b800ac595b65aedde.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_23b4af6c6ac04f7f90ad7442de4e2dc3.pdf
    • https://static.usrfiles.com/ugd/e745be_ea58f170c494440bbd493f792ad9004e.pdf
    • https://static.usrfiles.com/ugd/3be3a7_51594c2920294f5f91300369e68c951a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8e7c30b520c4ffebb6fd17377e90353.pdf
    • https://static.usrfiles.com/ugd/73c254_7b1cf84815264337945035755ea851db.pdf
    • https://static.usrfiles.com/ugd/9757e7_8862365e31694761ac66dfeaec269b94.pdf
    • https://static.usrfiles.com/ugd/724bd4_c80de1972492464fb923499ab12ac3a0.pdf
    • https://static.usrfiles.com/ugd/8cbfce_329110130273432a89c632759639a2c6.pdf
    • https://static.usrfiles.com/ugd/7598fa_23410e631f77438e8ab2e33025bd1472.pdf
    • https://static.usrfiles.com/ugd/0aab01_3b7e98cd1bd94714aacba80cb00d3718.pdf
    • https://static.usrfiles.com/ugd/34e21e_2eda40fd9ee24894ad859b2fed4efe2e.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/36925584754.pdf
    • https://cdn.shopify.com/s/files/1/0437/0091/2283/files/sanyo_dp_42740.pdf
    • https://cdn.shopify.com/s/files/1/0429/5213/0716/files/attestation_de_travail_et_de_salaire_cnas.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_off00006135.bin
0f449444ddde2db2583c72c3966ab511bb92cc862f08ea2feb153800ebbfa657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6135 5396 bytes
font_01_sfnt_off00007378.bin
1e168bfb0d65cb87681c031bf14a76725d362abc95c8502aa3c41cc11e339fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7378 10400 bytes

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