Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcd0f9682fbb795…

MALICIOUS

PDF

38.1 KB Created: 2020-09-02 10:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc66b3f98ac277d8c13fd0dd1a384767 SHA-1: 39dc9833cb4f01388166d35957b05efb37301fc6 SHA-256: 0fcd0f9682fbb795fc16ed6b6cd66e62e1d0537a953663c02c5c8d277ab2ab79
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links, with one prominent URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and a list of other URLs hosted on Shopify, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document 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=ek+chumma+song
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/mujepadigisuxisot.pdf
    • https://cdn.shopify.com/s/files/1/0438/1098/0000/files/frp_bypass_apk_with_pc.pdf
    • https://cdn.shopify.com/s/files/1/0460/4185/8212/files/82961927397.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/fukuvuvodokimeje.pdf
    • https://cdn.shopify.com/s/files/1/0428/6912/9372/files/92955888200.pdf
    • https://static.usrfiles.com/ugd/1df9ea_b08cb42f06f848249b516bb4148761c4.pdf
    • https://static.usrfiles.com/ugd/7baf93_e33a7698a5c04be7b5bec273a4e52261.pdf
    • https://static.usrfiles.com/ugd/69b86f_d09ace96261247099c68b1943238048b.pdf
    • https://static.usrfiles.com/ugd/bb05c1_777724cd3c504748b5ef7e7a86a54759.pdf
    • https://static.usrfiles.com/ugd/73cb9e_2857eca7cadb421a85bbaff27f8c0d91.pdf
    • https://static.usrfiles.com/ugd/370ea2_88b1c359c7954684a15868dc6e247da4.pdf
    • https://static.usrfiles.com/ugd/6f53d7_65a3176723b249bda4a7378c001a6548.pdf
    • https://static.usrfiles.com/ugd/217d68_6cab1bc33fdb4e7584a6c7dcf68b8b12.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba8772f2c4e049fcba55756e780f180c.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_6d7c5d3c71974e73b907e72034b5ac30.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_off00004f36.bin
281c86ee5f8be2756324665578cc95cf9754da14d60b828836bfa77b69895041
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F36 5104 bytes
font_01_sfnt_off00006075.bin
ef542abbd8bfa542aefbe83f20a88ae93f86b79bb388a23cb819e52be2a635e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6075 13664 bytes