Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64fd0ebebb738f0…

MALICIOUS

PDF

40.7 KB Created: 2020-08-24 07:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d8480e4582442a90fd757a562a51287 SHA-1: 717fddd1f235fdcb11b5dab1c235e944fc1b9a3d SHA-256: b64fd0ebebb738f0dec5121ca30cd2376b09403550d614de4b4807dfbb6c0ef5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious due to containing a link farm with multiple external PDF links, including a redirector to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same redirector URL and references to 'big fish games for android tablet', suggesting a lure. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=big+fish+games+for+android+tablet
    • http://files.ehsboyslax.com/uploads/1/3/1/4/131438077/zukidofiwativolakew.pdf
    • https://cdn.shopify.com/s/files/1/0437/2755/2661/files/vapomepabudegode.pdf
    • https://cdn.shopify.com/s/files/1/0431/8566/8255/files/89875454636.pdf
    • https://cdn.shopify.com/s/files/1/0433/3669/5959/files/34731419229.pdf
    • https://cdn.shopify.com/s/files/1/0435/5339/0743/files/accounting_audit_report_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/alopecia_en_mujeres_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0436/6581/7753/files/90192771234.pdf
    • https://cdn.shopify.com/s/files/1/0433/7070/9142/files/finding_fractions_of_amounts_worksheet_tes.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/28261464808.pdf
    • https://cdn.shopify.com/s/files/1/0448/1089/5520/files/accountancy_comprehensive_project_for_class_12_cbse_2020_20.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006065.bin
96face9e1e76d87a1d73bd13020f8c31ec400e9d63228e573e4e1c7ec90748dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6065 5512 bytes
font_01_sfnt_off000072f4.bin
12c1b679129e175028592013221848ade8dae8e00c714602d0639b88ad8f07ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F4 10428 bytes

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