Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97ab8b731e5c074…

MALICIOUS

PDF

41.2 KB Created: 2020-08-12 16:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a66ed9b93059f1318399ab60bd03059 SHA-1: 72b8fbbca788e38977a41f4457fa7d3a9d53072f SHA-256: e97ab8b731e5c0741000f35c946e3ef33ce863630f3cf2a6a73e9db42b4bf300
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF contains a significant number of embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. Another critical heuristic indicates a PDF link farm, suggesting SEO manipulation or a large-scale distribution effort. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are consistent with the heuristics.

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.cc/pify?keyword=linking+verb+worksheets+with+answer+key+pdf
    • http://files.arctictreasures.shop/uploads/1/3/0/8/130815009/2e77e.pdf
    • http://files.jerichotownlibraryvt.org/uploads/1/3/1/4/131454501/ec79f8.pdf
    • http://natoti.mrreckling.com/uploads/1/3/0/7/130776158/redag_puzabo.pdf
    • http://files.thebrightishside.com/uploads/1/3/1/6/131637881/mibabegugijonizuki.pdf
    • http://files.rpdk9history.com/uploads/1/3/0/8/130813979/bison.pdf
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/xuxomokiralagoreboduroru.pdf
    • https://cdn.shopify.com/s/files/1/0434/3860/4450/files/67244033810.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/filejukilosi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0462/3010/files/12894755898.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7872/files/retexalumogozezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98223768302.pdf
    • https://cdn.shopify.com/s/files/1/0440/6516/1366/files/andreas_moritz_livre.pdf
    • https://cdn.shopify.com/s/files/1/0437/6595/6759/files/goosebumps_complete.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/84091748539.pdf
    • https://cdn.shopify.com/s/files/1/0450/3791/2214/files/58759343830.pdf
    • https://cdn.shopify.com/s/files/1/0434/0544/3233/files/zekudovuvilul.pdf
    • https://cdn.shopify.com/s/files/1/0433/3145/3081/files/wavazuvolozed.pdf
    • https://cdn.shopify.com/s/files/1/0436/5441/4494/files/kevimawur.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_off000061d3.bin
28b6cd995e856dfb1566b5666defe06e17f610a5cce63cb65eb295c9bd354578		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D3 5668 bytes
font_01_sfnt_off00007535.bin
e71bc9c68bb02f0950ff778292c5c9001856b63aecc485a293911c6d0c273af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7535 10100 bytes

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