Malicious PDF — malware analysis report

Static analysis result for SHA-256 59cc66bc023f479b…

MALICIOUS

PDF

41.3 KB Created: 2020-09-03 22:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 037bf2f8cd54caa421359798bda2058d SHA-1: b5c33abdd89f14870bebb69f16742e6d49c8ff92 SHA-256: 59cc66bc023f479b607344842e6f5521ba32bf267b2e62d331e2b53822d404f0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to SEO-optimized PDF hosting sites, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a PDF about 'pneumatic cylinder specifications', which is likely a lure to encourage clicks on the embedded malicious URL. The ML classifier also strongly indicated maliciousness.

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=pneumatic+cylinder+specifications+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static.usrfiles.com/ugd/0fdb6d_0f318901756043b0a0bb5147760392cc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9f2514_6eb46540aed54050b890e6aa84f3d590.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c63dba_aab17140189744689a9bd2e193fafe62.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/120f26_46c7bef548c343b0848b325fe8846be0.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/teorema_de_congruencia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/vuvovutuwawusinat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0862/1719/files/diraxanusajalemapa.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_4894bbb1a51b432d995f3a6f5d64b0ce.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c3f59f_a1baf3ac223c4da6b5e255bd4ea034c8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/98d639_0f497c6b4c08434694e3a0f09cab48d7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e2b09b_acb3ff37284e4af7bb34ba385b7ec489.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/64f9d2_65d975a19ce44b629b43f3faa1bbf5f3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a98ecc_d6e313b4f7134616b670ac267a2ee97f.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000562b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x562B 5284 bytes
SHA-256: e92b1d2fd5e3fccb6e09d602ac922596c7d75380419f353f645f391c95bcd9b5
font_01_sfnt_off00006806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6806 9908 bytes
SHA-256: 3cbf2387f9ada1860a5f7d128ef675edb161f8dfc2481ce06e898d3e2217651c
font_02_sfnt_off000089dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89DC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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