Malicious PDF — malware analysis report

Static analysis result for SHA-256 394991c5191cf330…

MALICIOUS

PDF

54.9 KB Created: 2020-10-26 07:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8ee2bf41579aa05ec6472cf32d9b26db SHA-1: 9d7411754629969f38a4c2dd2c095178357452c9 SHA-256: 394991c5191cf330ed6653d39ea730eba88310716772be0b3a23fa0c61368549
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/123?keyword=headspace+apk+premium+2020 In PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/94f126fd.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/83a6454.pdfIn PDF document text
    • https://pusobufuronuwu.weebly.com/uploads/1/3/4/4/134475569/zudovoruzaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f880df7bb577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f86fa6becc13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404741/normal_5f959c79a2a7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f87fbc51ac98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5f9617c9d3eb8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mipeboro/fifizijulasidavebipivo.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/398196314.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/acidemia_metilmalonica_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/web_design_price_list_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/89241975977.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/tigonozotexosivavilipep.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/formasi_cpns_bengkulu_tengah_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/harry_potter_sheet_music_flute.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0458/0881/2198/files/58381917084.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8837/0582/files/susomoronetakoxoxapunigiv.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/74058572749.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/gibenozidiw.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78EB 5488 bytes
SHA-256: e581079c43a478e744bb7f2fe52d4d76491c7c919c4a87a8bd1a82a60ad412c9
font_01_sfnt_off00008b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B79 13416 bytes
SHA-256: c4dd68ef3cf93c8585242eab1ad57b1bab4528f8e56a06d9ae68545b2af82108
font_02_sfnt_off0000b763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB763 16060 bytes
SHA-256: eb67323a3edc51f073cf7ae7c668a4400309481d93a41d1ca3bfc03d889966df

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