Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7b4d50b257dcc1…

MALICIOUS

PDF

53.0 KB Created: 2020-10-20 11:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 1038652f05fb2152c76d739b06e7feb5 SHA-1: 5e56d48129052a8d04d441b9575b34707458923e SHA-256: 4b7b4d50b257dcc123e77eae3b5a03616aba81b05924301fb8caa68cc0290b04
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by an ML classifier and contains a large number of embedded URLs, many of which point to redirector infrastructure or link farms. The primary URL, 'https://ttraff.cc/pify?keyword=studio+21+b1+pdf', suggests a potential phishing or scam lure. The document body, though heavily obfuscated, also contains URLs, reinforcing the malicious intent.

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.cc/pify?keyword=studio+21+b1+pdf In PDF document text
    • https://meporolokiso.weebly.com/uploads/1/3/2/6/132681401/6408329.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/700003.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/tokizivofakisejav.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/400883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_5f8a6d8972f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f8d1da7b9d20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f89d004bdeed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5f88965f47f05.pdfIn PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/2987289.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/da194e45eee.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/1/0429/9259/9193/files/79578184060.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9302/3638/files/jacob_ladder_piercings.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5693/4297/files/nijonorixidida.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1306/3335/files/chemistry_questions_for_ssc_cgl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0475/1776/1702/files/zifopitisitiwusimid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/wii_forwarder_channel_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/probability_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/351ffe50-5d18-4a75-8a61-42fe6467f010/33740453317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93764ac-c661-4fa1-8bf4-e6e6a6bf36c1/82296954104.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_off000091c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91C0 4948 bytes
SHA-256: 9436d172fa8d305215186dd94a88596e981a49f28b3fa380aa6c6c6536330baf
font_01_sfnt_off0000a2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2AE 10944 bytes
SHA-256: d3c945e2f423844c8dc014615c30a022333d91f41b2f8efd0ddf45c66b4278ec

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