Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70f61c31d1a65e7…

MALICIOUS

PDF

44.4 KB Created: 2020-10-28 06:29:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 99582250a104c36daf0fb536057e28ba SHA-1: f21d9ecad21c44d7974b68f3935da8fd11fbf1d5 SHA-256: d70f61c31d1a65e74775f45f97e3c8481b1c36e2012ffd61b55e6836da7cacf6
154 Risk Score

Malware Insights

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

This PDF document contains a link farm designed to appear as legitimate library resources, but it redirects to a known malicious URL. The ML classifier strongly indicates maliciousness, and the embedded URLs suggest a phishing or redirection attempt to a malicious site. No scripts were extracted, but the PDF structure itself is used to host and present the malicious links.

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=manchester+nh+library+ebooks In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f8c4277dff12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_5f98cc68582dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9929/4363/files/bebewupesukovuza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7970/1158/files/unique_oromo_baby_names.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3318/8762/files/lazimenuvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7488/7090/files/tubemate_download_2020_version_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee122201-6aca-4883-89cc-5bb8b6f2afcf/sipebufivowolereb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eee82b0-e65e-4856-9c5e-a3807b5c9e71/renewaire_ev_130_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4431aff5-ad2e-44f4-b81e-49dbe966d281/50483247095.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/7756/7132/files/sanuvuwakosaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3562/3076/files/metal_slug_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8050/6773/files/momapifutirir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9559/8272/files/19892084566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b34e5d-f3b6-478d-97c3-bd9981d41ed1/jotizorita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/259f2d72-32ef-4346-881e-46b8f0a8884c/28389354474.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB4 5196 bytes
SHA-256: 3876f29ca62de0cfe23d28de6d2db09f7212a404464123a3ca856865163c5c94
font_01_sfnt_off00007e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E59 11372 bytes
SHA-256: f9c9689432f21ba26e0ca76b51b70c3bb3242ef4b31cc8bedf24c955889da550

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