Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2e4a51a3dd39f6…

MALICIOUS

PDF

39.5 KB Created: 2020-08-14 18:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b91ee55fede8ce896c74c1fa68f0947 SHA-1: 67e5ce114f10c40dce46720dd96d4d4b552c303d SHA-256: 1b2e4a51a3dd39f6afe0b939cbf03e3f0c1de271289549867f83cd7b59ae00e9
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains text related to 'binary decimal octal hexadecimal converter' and includes the malicious URL. This suggests a phishing or redirection attack aimed at users seeking conversion tools. The presence of a link farm heuristic further supports the malicious intent of distributing links to potentially harmful sites.

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.com/pify?keyword=binary+decimal+octal+hexadecimal+converter
    • http://vemivisi.teamemfield.com/uploads/1/3/1/6/131637419/tekulufifit.pdf
    • http://xenabazal.dmrcrafters.com/uploads/1/3/1/1/131164250/85822c5744461.pdf
    • http://files.joyfulsoundchoir.org/uploads/1/3/1/3/131398377/09ba6a.pdf
    • http://files.liongroupllc.com/uploads/1/3/1/1/131164250/lodiwetuduj.pdf
    • http://files.somedaynewfoundlands.com/uploads/1/3/1/4/131454549/bememezaxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9971/6770/files/zifud.pdf
    • https://cdn.shopify.com/s/files/1/0434/1055/5041/files/tipos_de_aprendizagem_organizacional.pdf
    • https://cdn.shopify.com/s/files/1/0431/8714/2818/files/91125928140.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4745/files/ramulisoxep.pdf
    • https://cdn.shopify.com/s/files/1/0440/9815/8744/files/vibawuwifivosefinad.pdf
    • https://cdn.shopify.com/s/files/1/0438/0780/1504/files/encode_to_base64_js.pdf
    • https://cdn.shopify.com/s/files/1/0428/5038/6079/files/78711285234.pdf
    • https://cdn.shopify.com/s/files/1/0430/3156/0354/files/37488017235.pdf
    • https://cdn.shopify.com/s/files/1/0439/4650/8456/files/noughts_and_crosses_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/94677122942.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8626/files/self_contained_breathing_apparatus.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3799/files/93803974211.pdf
    • https://cdn.shopify.com/s/files/1/0431/4205/4048/files/amantes_para_sempre.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_off00005595.bin
9a7b2123b980672cf03cd9570753f7a989576af9456626ab79f9523d4e6c3130		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5595 5280 bytes
font_01_sfnt_off00006762.bin
347d7b1df1073b17fd9d80eabaf958fad0e85056744e673d01d2aaca09d24301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6762 13136 bytes

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