Malicious PDF — malware analysis report

Static analysis result for SHA-256 79787587ebac637b…

MALICIOUS

PDF

35.7 KB Created: 2020-09-04 00:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f68bad50788273a0a28c816e1f6c31f SHA-1: 2cc3ed3d2f428df254e3c514a54f196f0d97576e SHA-256: 79787587ebac637bd3f17d6abd0ad2db2bb12a91db494213f2f3a12f1aec8337
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains text related to 'Eureka math book grade 7 answers' and includes the malicious URL. This suggests a lure to trick users into clicking the link, likely for a scam or to download further malicious 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.link/wix?keyword=eureka+math+book+grade+7+answers
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8861538602.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/liwekubulojerokuxofig.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7346/files/abraham_hicks_books_free_download.pdf
    • https://static.usrfiles.com/ugd/fdd6c2_861a2397bfae4b8f9688c7a2d11a1f17.pdf
    • https://static.usrfiles.com/ugd/a8c229_4913e2d0570b4637bed58eb5acc5d385.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_30ca563b0b764f76aa67df8b8b13a1fd.pdf
    • https://static.usrfiles.com/ugd/5de1df_a12ff2ad274c46f8834a764bd7c89e16.pdf
    • https://static.usrfiles.com/ugd/3f4b99_f4e2fc19376647599c0722a3e5501d81.pdf
    • https://static.usrfiles.com/ugd/daca0d_e26e83395d504c63b687560145b01a95.pdf
    • https://static.usrfiles.com/ugd/72b0e7_a2835e2d5fe5483bac24352c5bd800af.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_4e326df4c45a4dc59b1e9e04727d06e6.pdf
    • https://static.usrfiles.com/ugd/f0e51d_b33850ad6ee04d369d8128f8bf23e4fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b0882b86e8a4492811bb1f9dd81a0cf.pdf
    • https://static.usrfiles.com/ugd/9219f8_47018c457c5c4beb87c041bd2505b633.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_09756e885614452db7fca52246baa4b1.pdf
    • https://static.usrfiles.com/ugd/c068f8_31c17d21a1de4d3e839024ff064cc2e9.pdf
    • https://static.usrfiles.com/ugd/6a7407_66ecba0e227741d4a5b7b537bb8952a7.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_off00004754.bin
518e15ff8dd40cddbce03105da3c064adef206565e9f284a75c6d511623f16a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x4754 5540 bytes
font_01_sfnt_off00005a1c.bin
3bdb18e2471c7868f4ac347fea27a0062916583b09028b8c0e6b615cee48ae4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A1C 12068 bytes