Malicious PDF — malware analysis report

Static analysis result for SHA-256 527b2194a49f74de…

MALICIOUS

PDF

47.3 KB Created: 2020-08-31 06:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c111da3c11694eadafc326c13a794730 SHA-1: 90dbbb1af374decbc7f9674e17ebd8abaead3a96 SHA-256: 527b2194a49f74de57a60a0b47fef45f38b77da171fd956a308193e6f17f0d7e
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/wix?keyword=postcards+from+the+edge+carrie+fisher'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links pointing to external PDF files, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector and the link farm strongly suggest a phishing or SEO poisoning 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.cc/wix?keyword=postcards+from+the+edge+carrie+fisher
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/zopipugewipe.pdf
    • https://cdn.shopify.com/s/files/1/0438/7789/2264/files/blank_south_asia_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/gipojurogovaxitex.pdf
    • https://static.usrfiles.com/ugd/b8c837_1318525437d04026a36bb8fd533469f4.pdf
    • https://static.usrfiles.com/ugd/96768c_c0cf6c5333ff4ddd821dc7c92c24665e.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_2cebfe308a0442fe927734d0c5bf115c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e6c73a0db134c0095ad4887dd126290.pdf
    • https://static.usrfiles.com/ugd/1f6d71_49e86b1a75804cdc9fb05ea04aaad6f1.pdf
    • https://cdn.shopify.com/s/files/1/0437/6172/9685/files/13362357736.pdf
    • https://cdn.shopify.com/s/files/1/0431/1757/6354/files/50224079933.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/rudutiwinawubuko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gekubamunanapomokavonata.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8044/files/92803634972.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_off0000787f.bin
eed5057515f3df11031d2b48c63fc94312228086e677e8926847a34c885705df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787F 5404 bytes
font_01_sfnt_off00008ab2.bin
143390021f76b390f04bf7854df20f746590c6ac4a850eaec1f17d9ea9820622		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB2 10976 bytes

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