Malicious PDF — malware analysis report

Static analysis result for SHA-256 88eddf8ab42f6968…

MALICIOUS

PDF

39.5 KB Created: 2020-08-28 20:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1eda2be2b606d3afba158f35a6e05d7 SHA-1: d4e622b156c59db55252c692ffc6617ca7061d73 SHA-256: 88eddf8ab42f6968b8c7ec9b1b670a5612e5f69d592110490d299cc2890cb489
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the malicious URL. This indicates an attempt to lure users to malicious infrastructure, likely for phishing or a scam. The ML classifier strongly supports the malicious verdict.

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.cc/wix?keyword=emma+mae+hustler
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0459/5951/2223/files/feputawubebazejapu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/51168188711.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/srimad_bhagavatam_english_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7165/2508/files/economic_effects_of_slavery_in_africa_pdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_462a32b997ce4dbf8f8589a801444202.pdf
    • https://static.usrfiles.com/ugd/b8c837_c970f4ca78c74065a324323e999182f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bde45607d7d45798d5c14c2ef08990e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8c1b7c2300c4639b99ccf2f4fdb7625.pdf
    • https://static.usrfiles.com/ugd/b8c837_a182443aa60d49d9aceba2fbf9fcfffd.pdf
    • https://static.usrfiles.com/ugd/b8c837_55e7767d0cdd483a97363b0b4daa3e13.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1c22cce53d44ffab0fb13b1d5cecbab.pdf
    • https://static.usrfiles.com/ugd/b8c837_169ef3c8b5bf44cd98003b3c48c365e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_440114f5513f4854b313b69758118795.pdf
    • https://static.usrfiles.com/ugd/b8c837_3fbf20b3a4684a5ba762c53a39b1ad9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c40bed4106164791b4c1f9a8b5d2d4de.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e917a9ebfc84f4cb7f12620469f7aeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_c932625d6e78453ca8ecbc84a2ade8ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_115748a129394b8687d7017c60d30874.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_off00005d4d.bin
f846eb5142750e1702473fbf641945139c74ed18894ed4f50361a70f8f9bf8c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4D 4884 bytes
font_01_sfnt_off00006dbc.bin
06b98a6101886d91c450182b34bb1a294236677cf32fc3fc260195b9b22b5225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBC 10436 bytes

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