Malicious PDF — malware analysis report

Static analysis result for SHA-256 18091ad224631ebd…

MALICIOUS

PDF

44.3 KB Created: 2020-09-06 08:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12d13f5c3e2014b3926a6343ded246ff SHA-1: 5315083e414b7166efaafad744f9b7f73b389d4e SHA-256: 18091ad224631ebdcdd3fa814949c897a1212df7e5f7a295b695b9fec3a59bc3
154 Risk Score

Malware Insights

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

This PDF file contains a link to a known malicious redirector, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains text that appears to be a lure related to a "Nasa polar ice cap report". The presence of numerous external PDF links, many of which are benign, suggests a link farm or SEO poisoning attempt to increase the visibility of the malicious redirector. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=nasa+polar+ice+cap+report
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/2072cd_b53a74d418084f76aadf5961c5a8c42d.pdf
    • https://static.usrfiles.com/ugd/6f53d7_1265c8a1084743e581cc477ee610cb82.pdf
    • https://static.usrfiles.com/ugd/2ca22b_674c81faa106433da0589d992463390a.pdf
    • https://static.usrfiles.com/ugd/b8c837_4dbb0c6315ab470990b15fa186d3b1ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_41934b2beee5442ca25610b90fd6c930.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/acdc_highway_to_hell_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0438/2906/7933/files/vezaradurovuponenikuper.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/joseph_bible_movie_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0459/7494/5959/files/marksheet_of_class_10_2018_bsek.pdf
    • https://cdn.shopify.com/s/files/1/0434/7530/4612/files/zasawipitew.pdf
    • https://static.usrfiles.com/ugd/c46c8a_b2038740c34d4472ae7ab2cb62b15b09.pdf
    • https://static.usrfiles.com/ugd/b8c837_643fd96829174a5bada6054e7027b46e.pdf
    • https://static.usrfiles.com/ugd/b8c837_6eb543a0a3fe47a0903e4561e1c80e64.pdf
    • https://static.usrfiles.com/ugd/2994dd_7c5aa804460e4b419bba880558925bc1.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_off000068ec.bin
50c83b468938839b047733d7a2e2cf378ed8e6a0469df77f8474316d5e628efb
pdf-font-stream PDF embedded font (sfnt) at offset 0x68EC 4896 bytes
font_01_sfnt_off000079a8.bin
9a07ecbd2a1b756b725f65c1afb941dfea454feee492be96487f01463f02d3a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x79A8 13696 bytes