Malicious PDF — malware analysis report

Static analysis result for SHA-256 784a962b323eeabe…

MALICIOUS

PDF

46.5 KB Created: 2020-08-09 01:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75199592f06eb355e38fa30cd6c9dec1 SHA-1: 064f00755da5dcd068a9d2f0bda8751cb9a2ec19 SHA-256: 784a962b323eeabed810ccf1eff791f53ad87a4cc6e28a4cce803667654f7584
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be a precursor to a password-protected archive, often used to bypass security scans. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=visual+spanish+english+bilingual+dictionary+2da+ed.+2020+pdf
    • http://files.cameoimpressions.com/uploads/1/3/1/4/131482822/seteniv_ganajegemeped_jopagojajum.pdf
    • http://files.meganrecords.com/uploads/1/3/1/6/131636655/monijewowapavijo.pdf
    • http://wevaj.vaughnschool.com/uploads/1/3/1/8/131872269/kizogoliviz_tiderevepu_wunasimar.pdf
    • http://files.kruegervp.com/uploads/1/3/0/7/130776500/ruwolenamisi.pdf
    • http://files.northwestprep.org/uploads/1/3/1/4/131453429/5a2478fceb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/46306194711.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/6005/files/jharkhand_b._ed_entrance_exam_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44219577828.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/fifoxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijovosulodomozov.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/59478638002.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7591/files/stihl_fs45_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/6910/3528/files/farmacos_barbituricos.pdf
    • https://cdn.shopify.com/s/files/1/0431/3628/6877/files/doloxezabenikewibifu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2043/5112/files/losetewuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5267/files/introduction_to_leadership_northouse.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fexofedome.pdf
    • https://cdn.shopify.com/s/files/1/0434/1396/2919/files/commercial_aviation_safety_5th_edition_download.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_off00006675.bin
58582155f7f431b310970b57078cc4f6148c812ab94dbfd0cb6b7bb427e0bee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6675 5812 bytes
font_01_sfnt_off00007a31.bin
d008d5aa58f462f7098442d3e03eba8ce4c79d6705cb41138cccc45276eb6837		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A31 10540 bytes
font_02_sfnt_off00009e43.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E43 4324 bytes

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