Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a8463d4ff0a13b…

MALICIOUS

PDF

34.3 KB Created: 2020-09-16 23:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0163784b61117807f5830bde0731450e SHA-1: 174eaccd70cb4a91243da72f343dd89434b605b7 SHA-256: 72a8463d4ff0a13b8eafe1784d05849f990e44ed46e555feb605587f9e6bd17b
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to redirector infrastructure or potentially benign files. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The embedded links likely serve as a lure to direct users to malicious sites, potentially for phishing or malware distribution.

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=magnetism+worksheet+answer+key+gizmo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://36c9638f-0a60-4506-98f6-c18c153de237.filesusr.com/ugd/97aff7_c74e9d00eb2d49f0ac30282bc2764438.pdf?index=true
    • https://f6e33d4e-1420-467f-9f6a-81016adc70a4.filesusr.com/ugd/136d07_4404315565d342ea83f5400c81c29b2a.pdf?index=true
    • https://033cadbc-1aa3-4a8e-b28c-f0bffc5fdb38.filesusr.com/ugd/03f576_5e564630ed5f4e6e94c434e8d8ee22d3.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/5482265996.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/lesson_9.3_practice_b_geometry_answers_pages_588-596.pdf
    • https://3fcc6b2d-d62f-42ae-942d-0682dc10d326.filesusr.com/ugd/3bcfef_b0c79e978884403eb1ebe414ee136c6d.pdf?index=true
    • https://8a0c989b-17c9-4104-8bb9-0745af9632b5.filesusr.com/ugd/a771bd_a697a6ccea8a44e7b94b79efc180c5c9.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/78849744216.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/70041852980.pdf
    • https://cdn.shopify.com/s/files/1/0461/6896/5272/files/antec_performance_series_p8_review.pdf
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/56369447874.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_off0000485b.bin
e436b0330e42e4d79963726f2350812200786af8cac2759c0cca57422d46a45e
pdf-font-stream PDF embedded font (sfnt) at offset 0x485B 5380 bytes
font_01_sfnt_off00005aaa.bin
dd45e0d9407f6a5584f94da2cafb60e56b83665c3c5892325a614a530f177ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAA 9960 bytes