Malicious PDF — malware analysis report

Static analysis result for SHA-256 0312a328f1c2fddd…

MALICIOUS

PDF

43.0 KB Created: 2020-08-15 01:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bf0824064b685291cde9c012e0ed3b6 SHA-1: a382d7bd72d71445134a1d70abfe87e03a42e252 SHA-256: 0312a328f1c2fddd2648b60cdeb1eb4f7b80059335b851d8ecf1c3c31a99611e
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the embedded URLs suggest an attempt to redirect the user to a malicious site, likely for further exploitation or phishing.

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.com/wb?keyword=datos%20de%20irritacion%20peritoneal%20pdf
    • http://xinowaxag.ashleybradleyart.com/uploads/1/3/2/6/132681482/moxorezagela.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/1885/2264/files/jefisukuwoluta.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/3033786916.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2677/files/avani_avittam_2020_usa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0028/2783/files/mulabatepogo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/fabenozuteludemimuselewo.pdf
    • https://cdn.shopify.com/s/files/1/0440/3272/1046/files/72834122484.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/25143155485.pdf
    • https://cdn.shopify.com/s/files/1/0430/3516/4835/files/remevaxadataj.pdf
    • https://cdn.shopify.com/s/files/1/0436/2308/8290/files/tinoriminitun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bapumonotirugapagemuzigin.pdf
    • https://cdn.shopify.com/s/files/1/0428/6529/5526/files/79948672041.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5622/files/great_i_am_chords_and_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8456/files/administracin_de_recursos_humanos_bohlander.pdf
    • https://cdn.shopify.com/s/files/1/0433/3083/0494/files/93070541699.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bdd.bin
57bbb376231d4a9c7462c367010f2663e0b29f2a47a4fefe5ab67dd1a3723b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDD 4936 bytes
font_01_sfnt_off00006cab.bin
09d700dd23ce817ec85917bdffdaafe22b3624c7299bbca996a2765f49de4368		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAB 10628 bytes
font_02_sfnt_off00008f63.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F63 4324 bytes

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