Malicious PDF — malware analysis report

Static analysis result for SHA-256 17590f278d7a17b7…

MALICIOUS

PDF

47.4 KB Created: 2020-07-31 19:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d399c9768169e95a030ae421bc668fd8 SHA-1: afadab1a876c44ddf8a5e0db80384a86d2bfcf4b SHA-256: 17590f278d7a17b711a83985299608a76be8fdc4bbcca18430c6225e5a4ad308
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to an LG air conditioner and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which point to benign Shopify URLs, but the primary malicious link is the most concerning.

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=lg+r410a+air+conditioner
    • http://files.letterstosurvivors.com/uploads/1/3/2/7/132740204/3695897.pdf
    • http://files.vanaudelanalytix.com/uploads/1/3/0/8/130874587/filebaniremi.pdf
    • http://files.blaqbear.ca/uploads/1/3/1/8/131856860/jediwadawopobamam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/5446/5175/files/fexixow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xiguxalenagidofivixonagez.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8535/files/44660311284.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6821/files/tegadapetip.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/towano.pdf
    • https://cdn.shopify.com/s/files/1/0429/5131/1513/files/8224691801.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/74047007286.pdf
    • https://cdn.shopify.com/s/files/1/0432/6214/8763/files/deveg.pdf
    • https://cdn.shopify.com/s/files/1/0429/8519/3621/files/16565469497.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/5336508625.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/35346348254.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063b6.bin
d8f8b0bc433835c9a5250981f8cd3f2f8922aad8eeee53a93a89b5f9e056ec73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B6 3372 bytes
font_01_sfnt_off00006f59.bin
a823188f05c37c8262f65fe0396227b1209d3ddd3c90e4a6f595d500b4c7a957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F59 4908 bytes
font_02_sfnt_off00008015.bin
cd25965d3a8f1502b719144f5eec4c20d310639fbe7c6760faedc2b50baa3a28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8015 9968 bytes
font_03_sfnt_off0000a23a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA23A 4324 bytes

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