Malicious PDF — malware analysis report

Static analysis result for SHA-256 659c88a7974b61ad…

MALICIOUS

PDF

46.5 KB Created: 2020-08-14 00:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7a3954e907c25467151cc6184a5dc61 SHA-1: 702c2a92da4cbd0636d37d00371a1618d95cac0a SHA-256: 659c88a7974b61add1dd21fcdd9e4a1d36b7bdcadf050ab7775de36abadc85bf
162 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link and a link farm, indicating a phishing or scam attempt. The document body text includes a call-to-action phrase and the malicious URL, suggesting the user is intended to click the link. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=button+type+submit+form+action
    • http://files.kenpodvd.com/uploads/1/3/2/6/132695329/nisufer-wefefifotedepe-webavolugajilo-judigalijer.pdf
    • http://files.ecocaregreen.com/uploads/1/3/1/3/131384468/pavefofat.pdf
    • http://files.yourlushgarden.com/uploads/1/3/0/7/130740068/03036.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0850/6531/files/61239882421.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1087/files/vufavizujilirimunetigejag.pdf
    • https://cdn.shopify.com/s/files/1/0430/4135/7973/files/19435142549.pdf
    • https://cdn.shopify.com/s/files/1/0451/4581/7253/files/materiales_dentales_conocimientos_basicos_aplicados_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/62052645578.pdf
    • https://cdn.shopify.com/s/files/1/0448/1276/3298/files/aprendizaje_auditivo_visual_y_kinestesico.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32823332632.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/guide_to_understanding_personal_finance.pdf
    • https://cdn.shopify.com/s/files/1/0430/8795/4073/files/one_page_business_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/stored_procedure_mysql.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_off00006d25.bin
fd2e46ce26aa60c570586cb71863108c00a0684af72ac7134d8110976bd25e09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D25 5420 bytes
font_01_sfnt_off00007f82.bin
5e92896c147bdd37fe0d6df6fbf17755dfa1ce6c6f6f69c3674371a41ede36dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F82 14608 bytes

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