Malicious PDF — malware analysis report

Static analysis result for SHA-256 3309f85fad4ecee2…

MALICIOUS

PDF

48.8 KB Created: 2020-08-22 22:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfd2d124bcc61653d7bfe77df01c290b SHA-1: 756baf2d00867444e010c934086f34364c2598a6 SHA-256: 3309f85fad4ecee2c3870b6fb719c0f87cf1a5ac408a0a654af536c34a21a390
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a redirector link to ttraff.ru, indicating a malicious redirection attempt. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL within it reinforces the redirection attack pattern.

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=neumonia+nosocomial+pediatria+pdf+2018
    • http://files.hcmyc.org/uploads/1/3/1/1/131164067/jusam_boxeme_gikibaxon_zezosodej.pdf
    • http://rodinur.jadepublishing.org/uploads/1/3/0/7/130738629/8223200.pdf
    • http://gowore.davinciinitiative.org/uploads/1/3/0/7/130776486/7323826.pdf
    • http://dajuk.jlorennorris.com/uploads/1/3/0/7/130776031/bozedovowoga.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/casa_de_kenpo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5268/5720/files/dukopibo.pdf
    • https://cdn.shopify.com/s/files/1/0462/4384/0160/files/fortnightly_report_synonym.pdf
    • https://cdn.shopify.com/s/files/1/0437/9354/7424/files/difference_between_first_and_third_angle_projection.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/63358921853.pdf
    • https://cdn.shopify.com/s/files/1/0435/5663/4785/files/88677661806.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2399/files/mabixozitilupojojata.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9544/files/react_bootstrap_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdf
    • https://cdn.shopify.com/s/files/1/0439/8101/3150/files/editable_cv_templates.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/92657519227.pdf
    • https://cdn.shopify.com/s/files/1/0451/0951/0297/files/pengertian_atresia_bilier.pdf
    • https://cdn.shopify.com/s/files/1/0433/0396/0731/files/elizabeth_barrett_browning_aurora_leigh.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_off00007e5a.bin
3e800bcdadd0498a010d396449187b8b5c5136fde3dd2c73006c549ec406e21b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5A 5788 bytes
font_01_sfnt_off00009200.bin
ac8f7ad5ad38a75a0249c6db2333afad5a92fa01da1f62e7e3fb57ff8f90e922		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9200 10624 bytes

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