Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb43b591f5c0dd22…

MALICIOUS

PDF

39.6 KB Created: 2020-08-15 04:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7a3e68604395c733de68be5b5cf0a83 SHA-1: c27479715eb9f9a6b815f3c5d09f26a3c9416a6a SHA-256: cb43b591f5c0dd2273d226a48bf98df448c96f85b991c09765d930bf6fd8588a
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. Additionally, PDF_SEO_LINK_FARM suggests a large number of outbound links, many hosted on Shopify, likely to obscure the malicious redirector. The document body, though heavily corrupted, contains text related to 'converting mm to cm worksheet year 4' and the malicious URL, suggesting a lure for educational content. The primary malicious IOC is the redirector URL, which likely leads to further stages of an attack.

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.com/pify?keyword=converting+mm+to+cm+worksheet+year+4
    • http://lafemoxa.cleanteam-wc.com/uploads/1/3/1/4/131437252/zituxariferepa.pdf
    • http://files.stpetelimoservice.com/uploads/1/3/2/3/132303151/6ea4dc98ee1.pdf
    • http://files.risingstarschicago.com/uploads/1/3/2/6/132695543/migitenomururuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9359/0177/files/bible_stories_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3655/6962/files/80615666248.pdf
    • https://cdn.shopify.com/s/files/1/0437/7506/6273/files/68819681894.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/11211684556.pdf
    • https://cdn.shopify.com/s/files/1/0431/2249/1553/files/tixaduwuxolemejixetul.pdf
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/9625537002.pdf
    • https://cdn.shopify.com/s/files/1/0434/2553/0005/files/tulorekopifimon.pdf
    • https://cdn.shopify.com/s/files/1/0434/2356/3925/files/vunenabaruzetadobozilu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/wurelumijibeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/4090/6135/files/corporate_computer_security.pdf
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/soxijumipibasiwepa.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_off00005c39.bin
b003c743f2cb082f1317a527b1a53bfda3b391b874ee10c442a42be9a8db8a36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C39 5492 bytes
font_01_sfnt_off00006ee5.bin
43986a844338d7782999cca6a06d9918bbc97ec7ff3c9c7d30bb9bdbab84e868		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE5 10120 bytes

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