Malicious PDF — malware analysis report

Static analysis result for SHA-256 6616ef323e885f59…

MALICIOUS

PDF

53.5 KB Created: 2020-08-08 04:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 639af90767635003fe764047bc40c267 SHA-1: cba2dfd15d4efc675808685a5776c0814e407092 SHA-256: 6616ef323e885f59f9bd01e06711e1ba53a9b16b27947bf0202762c9b5cf900f
194 Risk Score

Malware Insights

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

This PDF document contains numerous links to external PDF files, many of which are hosted on suspicious domains and appear to be part of a link farm designed to manipulate search engine results. One prominent URL, 'https://ttraff.com/pify?keyword=piero+calamandrei+demasiados+abogados+pdf', is identified as a malicious redirector. The document also suggests it is password-protected, a common tactic to bypass gateway security by encrypting malicious payloads.

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=piero+calamandrei+demasiados+abogados+pdf
    • http://files.ashleyamanda-photography.com/uploads/1/3/1/3/131398177/lefegi.pdf
    • http://larubosop.dimensionsbydan.com/uploads/1/3/2/6/132681352/videg.pdf
    • http://doxuzumat.westendprimaryschool.co.uk/uploads/1/3/1/6/131636664/guxevolujob-sutuw-madip-xisifuzesegib.pdf
    • http://files.ame-geolab.com/uploads/1/3/1/6/131637402/gofibukazizo_texoji_beweku_dipopogi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/0673/8079/files/metegijixakig.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9960/files/49037194282.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/subomiganuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zutazalurofesavasa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87960197539.pdf
    • https://cdn.shopify.com/s/files/1/0437/1110/3128/files/nationwide_mortgage_statement.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/50173536560.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijev.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/beall_s_list_of_predatory_journals_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/2660/4447/files/ridatatuluzig.pdf
    • https://cdn.shopify.com/s/files/1/0432/7614/0710/files/4t65e_rebuild_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8995/2922/files/79304811535.pdf
    • https://cdn.shopify.com/s/files/1/0437/5976/3617/files/wuwex.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_off000083e9.bin
d062caca6e7c7a454100bf53ccd4a1df9c1e82c3bfe6550026973b280762ff60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E9 5324 bytes
font_01_sfnt_off000095d5.bin
56a1da544a4eac1da0d00f6ed0d187752eb14adb91dac4cb5c35f3719269c2fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95D5 11216 bytes
font_02_sfnt_off0000ba86.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA86 4324 bytes

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