Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0e5e31a69fdb24…

MALICIOUS

PDF

39.1 KB Created: 2020-08-30 13:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3561131c9d077cea281ffb17cbc1887a SHA-1: 9851895c0c0193733f82c0c3287024b95f6015fe SHA-256: 6a0e5e31a69fdb24464a7559a8be05b2d508a4b174e8d08753200fa64d216919
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same malicious URL and a list of other PDF links, reinforcing the lure. No scripts were extracted, but the presence of embedded URLs and the malicious redirector link strongly indicate a phishing or redirection attack.

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/wix?keyword=kelebe%25C4%259Fin+r%25C3%25BCyas%25C4%25B1+izle+unutulmaz+film
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/f65518_ee3fbc77e9314495976edea7b99b43ef.pdf
    • https://static.usrfiles.com/ugd/1b8612_96b744d5b5a247e98c136a52b4570bb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_a88f861a8e144978a1b0cae6ecfa9142.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/90881091516.pdf
    • https://cdn.shopify.com/s/files/1/0434/8474/1798/files/tibelud.pdf
    • https://cdn.shopify.com/s/files/1/0438/2782/2752/files/amar_chitra_katha_full_collection.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/bunov.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/55116112265.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc34b2d855ee421aa43f0491a8a22b25.pdf
    • https://static.usrfiles.com/ugd/b8c837_79eba934a7234347be9d08136de9d753.pdf
    • https://static.usrfiles.com/ugd/217d68_3513b368fcdc4bc59ca8eb5fb7029caa.pdf
    • https://static.usrfiles.com/ugd/b444d4_6a4ab1f0907046d2bcefb7229ae21eff.pdf
    • https://static.usrfiles.com/ugd/b8c837_424d2e06a9b944198bb36cef0e58beaf.pdf
    • https://static.usrfiles.com/ugd/5b5da7_5ff9093e87654639a7794f3123dd3d65.pdf
    • https://static.usrfiles.com/ugd/96768c_5a752c25ccd04ed399a3e254b480d0a6.pdf
    • https://static.usrfiles.com/ugd/760101_5f76196b800d46ecbbaab0ea92630108.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b75.bin
f07f1782935766b23c39dbf414fc10a5d13f035dd637dcf3ac4712264eb025c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B75 5328 bytes
font_01_sfnt_off00005d5b.bin
d0f3a6e531a8eb6fadaa0d9d85d1728f6a64df30ebd8831acfc34f7d2911117d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D5B 10348 bytes
font_02_sfnt_off00007eed.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EED 4324 bytes

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