Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9554c2147ae949…

MALICIOUS

PDF

33.3 KB Created: 2020-08-10 06:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c648f66af89cba3860767d397605ea0e SHA-1: 42b3c34e0102794d1e5da8e0bf454ac6d33daf17 SHA-256: ce9554c2147ae9492ea279712357c97d73643c46f6a4286b5b0ea2134b989ed6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=the+economist+2020+pdf+download'. Another critical heuristic indicated a PDF link farm, with many links pointing to Shopify domains, suggesting an attempt to distribute malicious content through a large number of URLs. The presence of these links and the ML classification strongly suggest a phishing or malware distribution attempt.

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.ru/pify?keyword=the+economist+2020+pdf+download
    • http://wawir.theperfectpairdolphintrilogy.com/uploads/1/3/0/8/130874493/mineder_vosapanujo_tanuweso_rogux.pdf
    • http://files.crossfitrochester.com/uploads/1/3/0/8/130814611/ccad86.pdf
    • http://files.sorrentoreview.com/uploads/1/3/1/4/131483445/f9e203189ed57d.pdf
    • http://lamutiwis.bringedlife.com/uploads/1/3/2/6/132695569/fibovavar.pdf
    • http://files.outreachchemistrycloud.com/uploads/1/3/0/9/130969573/lusivutabanuruwosi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/94932243042.pdf
    • https://cdn.shopify.com/s/files/1/0434/0537/7688/files/23931406736.pdf
    • https://cdn.shopify.com/s/files/1/0431/6410/6908/files/gerejo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6250/files/carnegie_learning_geometry_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9538/files/25818335822.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/91556870106.pdf
    • https://cdn.shopify.com/s/files/1/0433/1094/0328/files/complete_divine_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/equivalent_fractions_worksheets_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0432/7754/9726/files/91058567276.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/bukofuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/togew.pdf
    • https://cdn.shopify.com/s/files/1/0433/7179/0486/files/zelovadowenovu.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_off0000470d.bin
0751e505d18a045f48712d629737a29d1194a84061c170692ad0d727ac054844		 pdf-font-stream PDF embedded font (sfnt) at offset 0x470D 5616 bytes
font_01_sfnt_off00005a17.bin
365beacbcb07512c22a284cb1ecb8a7acd5d0d7ead0defdc266b8161f4f50b3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A17 8828 bytes

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