Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f51c555dd315930…

MALICIOUS

PDF

41.2 KB Created: 2020-11-02 12:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81f523b83a1ed66dd901a168918f41b4 SHA-1: 17e24d7bf6719f10e84c407f22100ecc026bb350 SHA-256: 8f51c555dd3159300f0d1c3f24c9c953df3b5babcba8f62d00934781ac4cae4f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a link to a known malicious redirector, which is designed to lead users to malicious websites. The document body also contains a URL that appears to be part of a link farm, likely for SEO manipulation to attract unsuspecting users. The ML classifier strongly indicated maliciousness, supporting the presence of these malicious indicators.

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/123?keyword=allstate+walmart+protection+plan+number
    • https://kiroteveve.weebly.com/uploads/1/3/4/3/134378898/baxajefuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3557560f-2aa2-40f8-8c55-218c50eaf5a9/xiletijesekoxatenetimusu.pdf
    • https://cdn.shopify.com/s/files/1/0496/7661/5833/files/libro_de_hermeneutica.pdf
    • https://s3.amazonaws.com/nimuwet/74693023119.pdf
    • https://s3.amazonaws.com/mijedusovineti/names_of_human_body_bones_filetype.pdf
    • https://uploads.strikinglycdn.com/files/4166b211-16cb-464b-8dde-be29f630b9a3/22190082563.pdf
    • https://uploads.strikinglycdn.com/files/467e613b-0ec2-42e3-b321-d7f1041aabe9/words_that_start_with_s_to_describe_someone_negatively.pdf
    • https://uploads.strikinglycdn.com/files/e47d8503-0902-4b0a-babe-77cbb5e5f05c/sidefidilowa.pdf
    • https://uploads.strikinglycdn.com/files/cf8675b3-7b42-49df-9718-8d0d2c1d0e5f/delezojanedavokazod.pdf
    • https://s3.amazonaws.com/jofunozuzof/73225352103.pdf
    • https://cdn.shopify.com/s/files/1/0504/4410/7950/files/earth_elemental_myrmidon_5e_stats.pdf
    • https://uploads.strikinglycdn.com/files/d812f742-e670-4258-9929-6f84e89ee1e5/vekawivozurisibukup.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_off000064e2.bin
7bdfaf0780aaabd8d3a8286d15129361685e6b4948948fab513d2265b6131552
pdf-font-stream PDF embedded font (sfnt) at offset 0x64E2 5300 bytes
font_01_sfnt_off000076da.bin
206678dc33d42db64b374d070f19ccc0bf31f0b4b13492621afbd35a46549c19
pdf-font-stream PDF embedded font (sfnt) at offset 0x76DA 9724 bytes