Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb3dfd9241cef51…

MALICIOUS

PDF

46.3 KB Created: 2020-07-24 07:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc2e64f1cabc6309c89101345842d39e SHA-1: 456b6d2713925797663994b276d4123abbe71b40 SHA-256: 7eb3dfd9241cef51691c422f2470ae8a01c99fe9680f0271186812b00eb8b290
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identifies a PDF link farm, suggesting SEO manipulation or a lure for users. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, limiting the analysis of direct execution capabilities.

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/wb?keyword=didier%20stevens%20pdf%20tools
    • http://files.messinger-systems.com/uploads/1/3/1/3/131380337/8702632.pdf
    • http://files.classiccutssd.com/uploads/1/3/0/7/130775107/50bfd155178eeda.pdf
    • http://files.mrscooksbayhighscienceclass.com/uploads/1/3/1/3/131384771/jejolibavosurejir.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/50327813813.pdf
    • https://cdn.shopify.com/s/files/1/0431/4451/1645/files/gadufupin.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/saripe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevaziretojigadogikoranab.pdf
    • https://cdn.shopify.com/s/files/1/0428/5281/0911/files/95794299160.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54313135065.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kubogofire.pdf
    • https://cdn.shopify.com/s/files/1/0432/7083/2283/files/medexibakefapabiduza.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/50740755287.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99324429390.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/
    • https://cdn.shopify.com/s/files/1/0428/5281/0911/files/95794299160.pd

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f70.bin
c0c44b2ba44d71cc5600992829247a2ed988758f459f99151c6df4859ea5ed9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F70 4672 bytes
font_01_sfnt_off00007f5d.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5D 1800 bytes
font_02_sfnt_off000087ea.bin
113bee5a919f6df66e65182e4a1f845e3d863f8afd34599e04b3af959814f43d
pdf-font-stream PDF embedded font (sfnt) at offset 0x87EA 10540 bytes