Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c988c36fd1d355a…

MALICIOUS

PDF

43.0 KB Created: 2020-08-10 08:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3b5044451ec226b32d02882fa11389c SHA-1: 04f8518f5e53f8cf49ddac0147a5a8ce8aaa255f SHA-256: 5c988c36fd1d355a68596d1b3e10ad9deb5c4f0a569952e44c940adbc4c09bac
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector, indicating an attempt to lead the user to malicious content. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of links were generated, likely for SEO poisoning or to distribute malware. The document body contains garbled text but also includes the URL 'https://ttraff.cc/pify?keyword=nuevos+anticoagulantes+orales+pdf+2020', which is flagged as a malicious redirector.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/pify?keyword=nuevos+anticoagulantes+orales+pdf+2020
    • http://files.northeastminneapoliselectrician.com/uploads/1/3/1/3/131380042/majisuzob.pdf
    • http://files.nutritionandhealthfiji.com/uploads/1/3/1/3/131380558/4c05d4b9562.pdf
    • http://files.learntodaytutoring.com/uploads/1/3/0/7/130775350/e2df50db.pdf
    • http://zuziwux.cincinnaticorporateyoga.com/uploads/1/3/1/4/131437987/tofigapigexunanuxuno.pdf
    • http://files.longxarts.com/uploads/1/3/1/4/131483719/b9deb89a3c5443.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/9155/6504/files/70009053516.pdf
    • https://cdn.shopify.com/s/files/1/0432/7745/1428/files/4519471163.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/sodika.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4175/files/voltage_regulator_ic_78xx_79xx.pdf
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/pasadena_weather_10_day.pdf
    • https://cdn.shopify.com/s/files/1/0430/9182/0695/files/89277597400.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6815/files/little_bay_de_noc_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/bawotolinadonuwanaduxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/ccna_routing_and_switching_200_125_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0446/7798/8505/files/perbedaan_adsorpsi_dan_absorpsi.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_off000064a0.bin
7c699be4fed100eaffe329210f21f6576808a83936aa1de9a6c876544f0ce7b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A0 5628 bytes
font_01_sfnt_off000077e8.bin
1a0bbf6acc52f2260d89dc01b75dcf2a077b5344dcf5c419bf36bc2b1b060b09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E8 11428 bytes

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