Malicious PDF — malware analysis report

Static analysis result for SHA-256 31965dc5f5ab0599…

MALICIOUS

PDF

40.5 KB Created: 2020-08-31 11:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9814ae3b6a15cd08d2a40f2643a5d338 SHA-1: a6e1b5f06b3caaec801d51e0b19a6a726525d996 SHA-256: 31965dc5f5ab0599338ebc15d454f1d05d9e51cc8f3e03ed2c66f95d131809cd
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Gypsy jazz progressions' and the malicious URL, suggesting a lure to a malicious site disguised as a resource. The ML classifier also strongly indicated maliciousness.

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=gypsy+jazz+progressions
    • https://cdn.shopify.com/s/files/1/0434/2651/3048/files/89114507251.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/81445694375.pdf
    • https://cdn.shopify.com/s/files/1/0440/5451/1766/files/rs_aggarwal_quantitative_aptitude.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/37289781355.pdf
    • https://cdn.shopify.com/s/files/1/0436/2777/4115/files/75870138241.pdf
    • https://cdn.shopify.com/s/files/1/0432/7761/5270/files/lapakaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/limasasifuxobikisivi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdf
    • https://cdn.shopify.com/s/files/1/0437/5265/2961/files/91135603623.pdf
    • https://cdn.shopify.com/s/files/1/0432/6290/2438/files/44877233552.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/fogunijorajus.pdf
    • https://cdn.shopify.com/s/files/1/0436/2177/7570/files/dolifuzojux.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_off00006142.bin
c4db800a41d114319eb412684ef566d3bda9d4bde6c15d14142f837431bbc790		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6142 5216 bytes
font_01_sfnt_off00007337.bin
13712ff0bd740d588650dceeff61190031760e1f0a895ca5076b0fd9905d4e89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7337 10008 bytes

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