Malicious PDF — malware analysis report

Static analysis result for SHA-256 4437bbf1f0556e1e…

MALICIOUS

PDF

45.1 KB Created: 2020-08-31 23:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a617b5f7132d5c1086a2c8ed304e271d SHA-1: fd4e015f70a3553573c37d34f9d66e1107d8e103 SHA-256: 4437bbf1f0556e1ebf398873b4bed35f6ed606186a1d5ab142f6f4cec3be7c69
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one heuristic specifically identifying a malicious redirector. The document body, though heavily obfuscated, contains text related to '4th grade math worksheets equivalent fractions' and a URL that appears to be a lure. The presence of numerous Shopify links suggests an attempt to blend malicious content with seemingly benign resources. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.me/wix?keyword=4th+grade+math+worksheets+equivalent+fractions
    • https://cdn.shopify.com/s/files/1/0429/9699/0105/files/3252751864.pdf
    • https://cdn.shopify.com/s/files/1/0435/1338/1028/files/nowobasifuwisitalobusutiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2490/files/edit_background_picture_in_word_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6387/files/63720889157.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/zetilipolimegidozebojuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1217/files/fabupibazumekedixi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/fluke_115_multimeter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/4582/1338/files/61727722762.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5901/files/43594217781.pdf
    • https://cdn.shopify.com/s/files/1/0438/3483/5094/files/90322127022.pdf
    • https://cdn.shopify.com/s/files/1/0436/3629/3785/files/22317633706.pdf
    • https://static.usrfiles.com/ugd/accd1f_17fd484b4bc040b0916706005590ffa4.pdf
    • https://static.usrfiles.com/ugd/b8c837_aacdb2b4e93540f9b50dc859f16f846e.pdf
    • https://static.usrfiles.com/ugd/824332_b5b5e534828d4ff9998d8e7050e6ee56.pdf
    • https://static.usrfiles.com/ugd/b3bc21_c14d37874c2d4268a5d6d720caf8c795.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_off000070aa.bin
fa8feeeaba20abaf0439117c48158498da6d821ad2bbde1ccb3d914c806c6048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70AA 5772 bytes
font_01_sfnt_off00008440.bin
e3da0139c933d89bd232e8ac488d65e5f7267aa8de42dd7fb94c5265e951c633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8440 10076 bytes

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