Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb331b6a1fee99c0…

MALICIOUS

PDF

51.5 KB Created: 2020-09-07 14:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9bb89c3d2f5a9e270ca1850d1a79b5d SHA-1: 25d06f9359c9dd4e819feb003180a7b04f6208c1 SHA-256: eb331b6a1fee99c0bd22342e5a14c34a916e17194501df98785d8cd68b07bffd
152 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, pointing to 'ttraff.me'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The presence of these elements suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=abyssal+demon+magic+guide
    • https://cdn.shopify.com/s/files/1/0430/6052/7253/files/asian_countries_and_capitals.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/wemivuzopaviwoxori.pdf
    • https://cdn.shopify.com/s/files/1/0445/5736/9503/files/statutory_liabilities_in_balance_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/lexawubuzaxixekene.pdf
    • https://cdn.shopify.com/s/files/1/0430/5649/6791/files/zosafozemojima.pdf
    • https://cdn.shopify.com/s/files/1/0433/9095/9766/files/computer_science_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1362/files/fomabadokofobi.pdf
    • https://cdn.shopify.com/s/files/1/0436/7020/8662/files/wixofiwubikuviza.pdf
    • https://cdn.shopify.com/s/files/1/0462/3371/4848/files/jefitajod.pdf
    • https://cdn.shopify.com/s/files/1/0430/6698/2561/files/xewuxafofotazi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3859/6510/files/taguj.pdf
    • https://static.usrfiles.com/ugd/d1c05f_97435b62617243c8a9e9eebe871c1b21.pdf
    • https://static.usrfiles.com/ugd/d2751c_9beac3230cb84f3bb9e638472d7f8fa3.pdf
    • https://static.usrfiles.com/ugd/17beed_f28919883f874430ab54257fa081dbcd.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_off00008b26.bin
cce324950ef3e94dcd3f0878436f3c02622da01051eba95cca2f62f7265e98a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B26 5392 bytes
font_01_sfnt_off00009d74.bin
a9586466a51c1aaeacc1a0e99c0c447861c79b1be07ac46437950fe06f4ae2f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D74 10364 bytes