Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f4746536080298…

MALICIOUS

PDF

84.0 KB Created: 2020-09-02 20:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f610c29ee26ea1f6fa153ad369ee2095 SHA-1: 521e6e22dd1ab4d39542d76cc59f08f7ceb1dd75 SHA-256: 72f47465360802985f8506ecbb0d4f1e39bc88d226af9dff8bb059f7bbd77990
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'report administrator job'. The ML classifier strongly indicates maliciousness, and the presence of multiple external PDF links suggests a link farm used for SEO poisoning or distributing 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.com/pify?keyword=report+administrator+job
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_051ad0a2673f4287b6d7440a6db212f2.pdf
    • https://static.usrfiles.com/ugd/599026_ed11d926be884dbc967e66b7e4d6798f.pdf
    • https://static.usrfiles.com/ugd/4dd980_27129a87fcd54347b0aae30ed2263763.pdf
    • https://static.usrfiles.com/ugd/111c46_46f47f93868d4e20897a3235bea34896.pdf
    • https://cdn.shopify.com/s/files/1/0433/3957/9546/files/89421588019.pdf
    • https://cdn.shopify.com/s/files/1/0436/3943/9510/files/libro_de_formacion_civica_y_etica_3_de_secundaria_contestado_2019.pdf
    • https://static.usrfiles.com/ugd/227d0f_c71c21c3cfb344eba11fb9add7ead2dd.pdf
    • https://static.usrfiles.com/ugd/911c12_83ba027c0e7e486e88562a705b57daa3.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d963c41c3254c718a19e9826dba365e.pdf
    • https://static.usrfiles.com/ugd/8e1900_f5b6355611a145c6b0b83ff302665efb.pdf
    • https://static.usrfiles.com/ugd/5cd33b_8a187e1ba9024fc5a673272afe4b578d.pdf
    • https://static.usrfiles.com/ugd/bf07b1_127e50c6ce49468ba0274b2f20ed7afb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc82.bin
f891d281c45d647ec1e64d01671133e292f345cfdb303ea862ec0b96d435ef3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 5084 bytes
font_01_sfnt_off00010dab.bin
394854d76638e35910bd632ea175c908667772985bc25c92fe12a42e7951c576
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 11568 bytes
font_02_sfnt_off000134fb.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x134FB 4324 bytes