Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ef800b910a5efa…

MALICIOUS

PDF

42.2 KB Created: 2020-08-12 01:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9bd05abb2aea21033a518e9ce30dd81 SHA-1: 341b9e60bffe01e401c9fb46588ef9470c542ed0 SHA-256: e7ef800b910a5efaaa9532672596182657a2c2d08a54eec7b38f67811642a6a3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with one link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'basic programs of c language pdf' and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL, which is likely used to funnel users to further 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.com/pify?keyword=basic+programs+of+c+language+pdf
    • http://files.csplash.org/uploads/1/3/1/6/131636978/cb211fc950.pdf
    • http://files.onepointerior.com/uploads/1/3/1/3/131384127/minajuxese.pdf
    • http://resopiwa.harrowphotographer.co.uk/uploads/1/3/0/9/130969772/f11bca7.pdf
    • http://tuxali.bblifeinsurance.com/uploads/1/3/0/8/130874365/nemutojew.pdf
    • http://files.lindyfurby.co.uk/uploads/1/3/1/4/131412558/pejamegupubugez-setuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/2847539748.pdf
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/duplicate_rows_in_excel.pdf
    • https://cdn.shopify.com/s/files/1/0440/8170/9206/files/muwejonigijegelaruso.pdf
    • https://cdn.shopify.com/s/files/1/0430/9942/2871/files/15683604163.pdf
    • https://cdn.shopify.com/s/files/1/0430/6262/4405/files/35742469788.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/48657003012.pdf
    • https://cdn.shopify.com/s/files/1/0449/2935/1835/files/mbstu_admission_circular_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0434/9417/8982/files/65473869748.pdf
    • https://cdn.shopify.com/s/files/1/0435/0499/2408/files/75018242435.pdf
    • https://cdn.shopify.com/s/files/1/0437/5917/3784/files/small_chrome_extension.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/28189977148.pdf
    • https://cdn.shopify.com/s/files/1/0429/2198/4166/files/fetiwuxesetisaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87678197609.pdf
    • https://cdn.shopify.com/s/files/1/0435/3989/0327/files/calendrio_de_vacinao_2020.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_off000064e1.bin
5f532766786b53f26f941faca66547c283bbff38000c89e9a9ff8058fa3f3359		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E1 5524 bytes
font_01_sfnt_off0000778f.bin
2fc082f1bd2d366c2be6711aca6f3cd1a1da331b3eff985296d63bf1423c0b83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778F 10644 bytes

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