Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e73951f69a87e0…

MALICIOUS

PDF

52.1 KB Created: 2020-10-26 02:50:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e5349d6ea125030741039408e9d921bf SHA-1: 3c2b819c83ae7f0a0acf477f82514c1265783b6d SHA-256: b8e73951f69a87e0cadf6619722cd0ccd417918839b9f508df0a0b3e26b6827f
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL related to 'filmic pro apk mirror'. This suggests a phishing or scam attempt, likely using a lure to trick users into downloading potentially malicious software or visiting further compromised sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.ru/123?keyword=filmic+pro+apk+mirror In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f899d01a054f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_5f8c4ea3a8717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f8bad854b842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5f9264b6dbe54.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/b4c6a3a.pdfIn PDF document text
    • https://wanezetisozol.weebly.com/uploads/1/3/4/4/134468493/kupobilozo_bekaten.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/63117c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b00d3bbb-bad5-4b00-abff-80ca8deb2129/93929817247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/679f7da1-e297-4e05-abe0-146e10f0a22d/essentials_of_chemical_reaction_engi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f529f5e8-2648-4c2b-bd8c-57101010effd/goxopefuririgowaxob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff47347-cfbf-4385-95e3-afb947f5a23a/11266647855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02512cfd-fc06-4878-b7ed-aef2c7dcc654/katy_perry_bon_appetit_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1374f78-1077-4821-8f89-dcbc2a0af079/ccl4_tipo_de_enlace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d684583c-1f1c-4131-93a8-60f4d0567818/sally_mann_hold_still.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/31065612372.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/procurement_efficiency_and_effectiveness.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/cdac_courses_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6134/4406/files/iphone_8_plus_ringtone_download_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/2263/1067/files/kekugizokibamutoko.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8010 4920 bytes
SHA-256: a6022c8d27a1eb6bcb0ab8a1b3299c40370f5a3e0f1b20c7cfa96c6745ceebc0
font_01_sfnt_off000090a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90A7 1796 bytes
SHA-256: d9f96797a54aa890ffc864a62d0ee1bea369dc139b9f5922dbee51669d5f236a
font_02_sfnt_off00009933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9933 12732 bytes
SHA-256: 01344711c372543334a1d4c615c330ed676d7b84320472bb13df38bd495308cd