Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac70dfad183fa23…

MALICIOUS

PDF

41.4 KB Created: 2020-08-20 03:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14cd45662e4b1fc09e67c0324c57c12a SHA-1: adf36b5239a80d3e910dea86866a3ae122316c16 SHA-256: 1ac70dfad183fa23924f6dedf6b72abb3ed5441617e5174ed386b4f694a952f7
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, disguised with a lure of job interview questions. The ML classifier strongly indicated maliciousness. The document body and embedded links suggest a phishing or redirection attack aimed at enticing users to click through to 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.ru/pify?keyword=job+interview+questions+and+answers+in+kenya
    • http://files.hammination.com/uploads/1/3/0/8/130813612/bureg.pdf
    • http://files.studiosix.biz/uploads/1/3/2/6/132681164/3e0cf.pdf
    • https://cdn.shopify.com/s/files/1/0436/8026/8438/files/6610980643.pdf
    • https://cdn.shopify.com/s/files/1/0437/8748/5342/files/9634653037.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7424/files/4813127380.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3703/files/kazujojuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/8400/5032/files/wuzipegidarulejometokid.pdf
    • https://cdn.shopify.com/s/files/1/0452/5237/8784/files/gmo_history.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/32314485365.pdf
    • https://cdn.shopify.com/s/files/1/0439/9942/8766/files/zekitukexus.pdf
    • https://cdn.shopify.com/s/files/1/0433/5996/1239/files/bizzy_bone_carbon_monoxide_full_album.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/35227561363.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_off00006225.bin
554dcc23af9832ed66715c114f11f45c88469bcf299ff779cfb686eeca70c00d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6225 5360 bytes
font_01_sfnt_off0000747f.bin
a3347959117e3f04bc78f4424be1ba4356df06228bb7f684df8ea2cf47a0823e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747F 10612 bytes

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