Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e016c6e3b28c0e…

MALICIOUS

PDF

43.9 KB Created: 2020-08-28 00:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed4a71f15b4cb8f1c803e3b8c9d8a2b2 SHA-1: 66161ab625ef88fd07d28e2e2e545ba7490a3d34 SHA-256: 83e016c6e3b28c0e6cb1063344e8114e2820899a201d4aa6d53d44504de0ba57
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a malicious redirector or benign files hosted on content delivery networks. This suggests a link farm or SEO manipulation tactic to distribute potentially malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of numerous external links strongly indicate a malicious intent to redirect users to harmful sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic of encrypting payloads, which is not directly observed but implied by the link farm.

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=libros+de+quimica+de+tercero+de+bachillerato
    • http://files.learnlikeapirate.com/uploads/1/3/1/0/131069819/vudiburon_zuramofonitidof.pdf
    • http://gusidisuz.hatcherforgeandleather.com/uploads/1/3/2/3/132302978/d5642b8dbed4.pdf
    • http://files.healthybodyhappyhearts.com/uploads/1/3/1/4/131438604/pivotumalalotidu.pdf
    • http://xafajol.isabelsherk.com/uploads/1/3/1/3/131379730/7126304.pdf
    • http://gilat.avivapressman.com/uploads/1/3/1/4/131406717/sulogogudu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/jobasirobilewukuru.pdf
    • https://cdn.shopify.com/s/files/1/0431/7216/7841/files/57187507890.pdf
    • https://cdn.shopify.com/s/files/1/0428/6719/6063/files/30174307365.pdf
    • https://cdn.shopify.com/s/files/1/0433/0822/0574/files/gawiwewovodekujodeko.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/40578562812.pdf
    • https://cdn.shopify.com/s/files/1/0438/8762/4344/files/kulimibufarukudakiwewin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/69858430908.pdf
    • https://cdn.shopify.com/s/files/1/0462/4154/6394/files/yo_despues_de_ti_pelicula_completa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/google_maps_como_chegar.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1408/files/5969676578.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/44004473182.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006610.bin
07eedf8deddeaf421a4664edda18eb2b3b5ad3888d40b636fa6c422f42034952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6610 5388 bytes
font_01_sfnt_off00007830.bin
c835c2502de0c6354b854b8ef36e5615f592f7900717918fd3915b7c9a8ebe4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7830 12612 bytes

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