Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22f8ff13eb95a5a…

MALICIOUS

PDF

50.6 KB Created: 2020-11-03 16:34:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14d3a5485e84d22eaee03b3fa8c27ff8 SHA-1: 915a0231589a647863e528c2e04a5a33eea1da2c SHA-256: f22f8ff13eb95a5a18c71eb8f825267c192fe32cf42d40a98589a2804bcbe6dd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign content, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to disguise malicious intent. 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.club/123?keyword=eyes+on+the+prize+questions+and+answers
    • https://cdn-cms.f-static.net/uploads/4379626/normal_5f90e45f25b40.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/01e18a11-1b65-48d5-93a8-78ddf44b4272/20_road_runner_cartoon_download_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0483/8087/0809/files/adobe_premiere_crack.pdf
    • https://uploads.strikinglycdn.com/files/2c165f85-1810-4946-b68e-41c890404dbc/froggy_gets_dressed.pdf
    • https://uploads.strikinglycdn.com/files/25c20240-b54e-4fab-891c-fe5ce77fe984/jelige.pdf
    • https://uploads.strikinglycdn.com/files/ea5e4d4b-1f9a-499a-81a6-5d0fa9582fbb/34664447577.pdf
    • https://uploads.strikinglycdn.com/files/bc8da1dc-ff52-4dea-98ad-0297ae8f2bc5/22978011249.pdf
    • https://cdn.shopify.com/s/files/1/0504/2438/1616/files/pokemon_sun_and_moon_mandjtv.pdf
    • https://uploads.strikinglycdn.com/files/1899ecfe-6c27-421b-ad76-22149e0ab3d1/new_hope_police_shooting.pdf
    • https://uploads.strikinglycdn.com/files/5ad1efec-040f-406c-8999-37695670ac53/42771769455.pdf
    • https://uploads.strikinglycdn.com/files/cdfc13c4-24c3-4dc9-9ff7-7c39551393e7/7183811821.pdf
    • https://uploads.strikinglycdn.com/files/4a9bcd71-71f6-4fdc-b411-91b58ab5de50/mandela_effect_reddit.pdf
    • https://uploads.strikinglycdn.com/files/637f28b5-c149-4ca9-9900-ce7bbf6f6fca/16580930612.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_off0000852c.bin
e81f105dd2174a5717c02028852528e68de870dbeb5f3b8679029faafe64e8f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x852C 5344 bytes
font_01_sfnt_off00009771.bin
ef8a5b42d315d917cddc28380dafd1eec24b7a58b3fb42ed6569c246f0284882
pdf-font-stream PDF embedded font (sfnt) at offset 0x9771 11208 bytes