Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e66bb7e9e5050b…

MALICIOUS

PDF

37.2 KB Created: 2020-08-13 01:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52d575b0b36e62e031426df49a18e1c4 SHA-1: bb18df1df3ceb5beb50a2b2743b1702f9fa8566e SHA-256: 37e66bb7e9e5050bcf6df6f3f4a847bf6fa2253c63bf62fa91ef0f5cfd3e3758
120 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on Shopify and appear to be SEO-optimized lures. One critical heuristic identified a link to a known malicious redirector, `https://ttraff.cc/wb?keyword=jurnal%20gastritis%20erosif%20pdf`, which is likely the primary malicious payload delivery mechanism. The document body itself is heavily obfuscated and contains embedded URLs, further supporting the malicious redirection attempt.

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/wb?keyword=jurnal%20gastritis%20erosif%20pdf
    • http://files.nxintl.com/uploads/1/3/1/0/131070911/nufawefomojoge_tadugusovok.pdf
    • http://files.arlingtonteosinte.org/uploads/1/3/1/4/131406629/vusiwipa.pdf
    • http://pifig.mail.shoreliteracy.org/uploads/1/3/1/3/131398097/8565179.pdf
    • https://cdn.shopify.com/s/files/1/0435/4975/3507/files/rubanibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7886/8387/files/atul_maheshwari_paper_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/oxford_dictionary_of_english.pdf
    • https://cdn.shopify.com/s/files/1/0435/3759/6575/files/matizibubudovunagapevafi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9764/4449/files/54716851666.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/62999068622.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/temarumipufonuwuvu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/bamigowasozakor.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/acquainted_with_the_night.pdf
    • https://cdn.shopify.com/s/files/1/0431/1518/4277/files/statistical_quality_control_eugene_grant.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_off000053ff.bin
53f192fc8ffbe5c6cb8d9fbf930a281b9a77cdbe106e6c5171dc596c87574b2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53FF 5200 bytes
font_01_sfnt_off000065ba.bin
1c688446214af40f620a34da3208784c5a92aea15aa85e029e1900785ae548b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BA 10008 bytes

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