Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae82a3b8725e8ce3…

MALICIOUS

PDF

60.0 KB Created: 2020-08-13 03:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee190dffad43de9d22e65827024fcd8c SHA-1: 10579d3f5995abcd197a7177afb97923a25d47af SHA-256: ae82a3b8725e8ce3bc5bfc9eaaeb210cb925bc1b34563a65cfd5ed32d1475215
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains with generated SEO-like slugs, but also includes a critical link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=spinocerebellar+degeneration+pdf'. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text but includes the same suspicious URL, suggesting the primary intent is to redirect users to malicious content, potentially for phishing or malware distribution.

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.ru/pify?keyword=spinocerebellar+degeneration+pdf
    • http://senoxevib.ecrcme.com/uploads/1/3/0/7/130776330/6024cca49052.pdf
    • http://files.peyerpianostudio.com/uploads/1/3/1/6/131607407/mudawobajira.pdf
    • http://files.smashsomethingtulsa.com/uploads/1/3/1/0/131071249/ridav.pdf
    • http://files.stchristophersnh.org/uploads/1/3/1/8/131872138/9568713.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/gavavazipuwodumu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/79878294833.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7335/files/88272361310.pdf
    • https://cdn.shopify.com/s/files/1/0435/8891/1267/files/foruvuxefozevanifez.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/15154447069.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bolosenisom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/35917299790.pdf
    • https://cdn.shopify.com/s/files/1/0434/3896/4903/files/accordi_chitarra_canzoni_napoletane.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4396/files/49179135609.pdf
    • https://cdn.shopify.com/s/files/1/0450/6012/8931/files/linear_programming_basic_concepts.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6975/files/alcatel_tracfone_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/2434/3462/files/pathfinder_core_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/4988/5606/files/fundamentos_de_administrao_financeira_stephen_ross.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009ac4.bin
080bc6f0d740eba221c673cf1bd62aebd71dc41378ec7a70d5625add2861fd00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC4 5176 bytes
font_01_sfnt_off0000ac4c.bin
5eeeb679b9fef6205166e6193abeff15577dece3115e55c7bf9035428a55da33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4C 12640 bytes
font_02_sfnt_off0000d48c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 4324 bytes

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