Malicious PDF — malware analysis report

Static analysis result for SHA-256 015bb8cfdd8f2088…

MALICIOUS

PDF

48.8 KB Created: 2020-08-07 03:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9099b9b03c2157fb17b7022374aac8f SHA-1: 41f1255dcbbf731dbd374629cbdcaf688a42911b SHA-256: 015bb8cfdd8f2088d2ba562ae68495ccec6af65163fe76eb86d648876099a491
194 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.com/pify?keyword=aprendizajes+clave+tercer+grado+primaria+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to educational materials and URLs, suggesting a lure to a malicious site. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates a common tactic of using password-protected archives to bypass security scans, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.com/pify?keyword=aprendizajes+clave+tercer+grado+primaria+pdf
    • http://files.settajay.com/uploads/1/3/0/7/130738641/1c61e5d9bf4.pdf
    • http://files.beevoice.net/uploads/1/3/1/6/131637839/duvufeguk.pdf
    • http://xegus.futuresparkcoaching.com/uploads/1/3/2/3/132302963/nukuzetadebojotor.pdf
    • http://files.westernenglishsetterclub.org/uploads/1/3/1/4/131437693/2479888.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/bofeboziduforumi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5021/2264/files/caterpillar_generator_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/8676/5475/files/66354950557.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/18079916756.pdf
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/55283963628.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6964/files/morurunamesoputes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/zudavepidopilabuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/66423078656.pdf
    • https://cdn.shopify.com/s/files/1/0431/1315/2673/files/tusekuguwirapaxasuxegoto.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://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000622f.bin
0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622F 6744 bytes
font_01_sfnt_off00007316.bin
33a693ef3eb4ea701801c9c345f6f2a1f7aec77687b45985b1ee4db4ba285eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7316 5648 bytes
font_02_sfnt_off0000864c.bin
2b17894289ef4ac549ca5ccbfe538e6ebde94701791c0542cba9a71f2d67f349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864C 2268 bytes
font_03_sfnt_off0000905f.bin
8649e4ab769befe6c948e7c879c97368a5b278db7731d9c027fa7e2ccc07a8d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x905F 10904 bytes

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