Malicious PDF — malware analysis report

Static analysis result for SHA-256 67425da9f9639873…

MALICIOUS

PDF

49.5 KB Created: 2020-08-08 22:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75676c411a8e1073885c0ae463a8d5ea SHA-1: b15a8327f6064d443c1ec5fcebf637137a26de26 SHA-256: 67425da9f9639873cab31c9e8c2d1bb68bf24454df414eccbbc8a094d98146c1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, includes a URL that appears to be part of a link farm designed to manipulate search engine results. The presence of a malicious redirector link and the sheer volume of outbound links suggest an attempt to drive traffic to potentially harmful sites, likely as part of a phishing or scam campaign.

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=analytic+geometry+sample+problems+with+solutions+pdf
    • http://files.ceecentre.com/uploads/1/3/1/6/131606262/b28866ad5.pdf
    • http://files.clearlyperfectionwc.com/uploads/1/3/0/8/130813769/8602780.pdf
    • http://files.eugeneglassroots.com/uploads/1/3/1/3/131398117/392925.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/davadotorometib.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/90443322682.pdf
    • https://cdn.shopify.com/s/files/1/0433/4731/2789/files/linujuwafumuxogolis.pdf
    • https://cdn.shopify.com/s/files/1/0439/8333/9678/files/cfa_level_2_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4632/files/rehearsal_psychology_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/9290/9987/files/2020_cadillac_srx_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/3459/7784/files/35001718686.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/95288728185.pdf
    • https://cdn.shopify.com/s/files/1/0430/9775/1709/files/accountant_job_advertisement.pdf
    • https://cdn.shopify.com/s/files/1/0431/9268/0605/files/kirkpatrick_model_of_curriculum_evaluation.pdf
    • https://cdn.shopify.com/s/files/1/0438/5685/5190/files/bexetixuvuxusuboxod.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/1862534055.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068b5.bin
93455381e226867f1f7b9a7442014052a69584c8b6e68f00180c083c6dfcd76a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B5 5892 bytes
font_01_sfnt_off00007caa.bin
c23bbe1c12735123b6fdab006ae1522e3c92c030f564f01091ef3e0a241754c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAA 11316 bytes
font_02_sfnt_off0000a370.bin
72b31fa68b409568beac21bc4e45735d84c16fcba0cd32355709b05f9330093b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA370 16116 bytes

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