Malicious PDF — malware analysis report

Static analysis result for SHA-256 936b2497b64fa795…

MALICIOUS

PDF

52.3 KB Created: 2020-08-24 23:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dd6a5efe4006727a91facc7b8616288 SHA-1: a578296d41d1949ea86e1056e98c83cffd94c21b SHA-256: 936b2497b64fa79540d9fe957b60c4a96313d8906f9e89300aac682340c6c901
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 domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'answering service medical term definition' and the malicious URL, suggesting a lure to a phishing or malware distribution site. 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.cc/pify?keyword=answering+service+medical+term+definition
    • http://zetade.mariettasquarefarmersmarket.com/uploads/1/3/1/0/131070382/fajoxomejajej.pdf
    • http://merejisos.patchesfamilycreamery.com/uploads/1/3/0/9/130969679/213e532af22ba.pdf
    • https://cdn.shopify.com/s/files/1/0437/7670/4669/files/werosupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2873/3352/files/nidesopemotufekukiwoneso.pdf
    • https://cdn.shopify.com/s/files/1/0436/3884/9696/files/timutedukefu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/vodugatirevi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2734/files/year_2_addition_and_subtraction_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0429/0795/9452/files/15811188595.pdf
    • https://cdn.shopify.com/s/files/1/0437/1811/5480/files/16263699475.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/felofamujowekovulatot.pdf
    • https://cdn.shopify.com/s/files/1/0444/6437/3927/files/filutegijuzesevizepijit.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_off00008db7.bin
4214bcb9ba7f7e76da9322d92a009d84ee8832288931076b45a5d2261cf04422		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB7 5480 bytes
font_01_sfnt_off0000a051.bin
b5211d75f235482dae5d07d81dc36ceec05823bac3b3e973f6a52eed3f921bb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA051 10720 bytes

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