Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cdfa55cfce0802…

MALICIOUS

PDF

63.1 KB Created: 2020-08-11 22:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fae605d44c7a913c8956ac0ca8ac055 SHA-1: 9cd1369718157b2fcc3e646f06f31dd6fc8452f5 SHA-256: f1cdfa55cfce0802d44a4d66a19f158f949d8daf498731403094f575e44320a1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, one of which, https://ttraff.com/pify?keyword=calendario+serie+d+2020+19+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a calendar and the PDF generation tool wkhtmltopdf, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, further indicates an attempt to distribute content or redirect users. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=calendario+serie+d+2020+19+pdf
    • http://files.bransfordmedpsych.com/uploads/1/3/1/4/131483002/palonilazumorilurod.pdf
    • http://sudawuse.kathleenajackson.com/uploads/1/3/2/6/132681352/feberudo-gadojim.pdf
    • http://jefixi.thebackpew.com/uploads/1/3/2/3/132303382/xarexe-jiwifasu.pdf
    • http://files.keepinitreelchartersunlimited.com/uploads/1/3/2/8/132814996/makos.pdf
    • http://files.positivepuptraining.com/uploads/1/3/0/8/130873795/4c420b86e155.pdf
    • https://cdn.shopify.com/s/files/1/0431/2249/1553/files/lujakoju.pdf
    • https://cdn.shopify.com/s/files/1/0435/4854/1079/files/34527988644.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/diradadojeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/jovudelizokoxav.pdf
    • https://cdn.shopify.com/s/files/1/0431/2121/3591/files/mupejekajesesufu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2809/3856/files/61366525199.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/bejodipexapawagoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/9478/5694/files/51619667791.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/94712659214.pdf
    • https://cdn.shopify.com/s/files/1/0437/8463/4530/files/partnership_fundamentals_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0436/0405/0084/files/54408188508.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6157/files/wedajulirorofij.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_off0000ad23.bin
41a6862745caa605ab928cbb5e620fbe4bad69933f15180362fa10170e17bf97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD23 5424 bytes
font_01_sfnt_off0000bf99.bin
e7002494216ca86a283a18e2c3eeb9c80bf81a3ad159a8b6d8c50a23261eaeea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF99 15840 bytes

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