Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a19a9b4ff129c4b…

MALICIOUS

PDF

71.0 KB Created: 2020-08-11 00:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 262abb6a07f27dd374823c0782b9694f SHA-1: 2a934d1d4e191d841054e3d358da8990d8dc1a24 SHA-256: 7a19a9b4ff129c4bea407c6e5c94ad69520caf70fd36947e2c123ce206ab7262
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=mohamed+al+ghazali+livre+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of this link farm.

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://ttraff.ru/pify?keyword=mohamed+al+ghazali+livre+pdf
    • http://femekik.adoxian.com/uploads/1/3/1/4/131407227/256cb.pdf
    • http://mavejirar.capstoneonline.com/uploads/1/3/1/6/131607240/0b770f08bf443fd.pdf
    • http://xilejad.northstarlodge167.org/uploads/1/3/2/7/132710797/futeja_kuginifilu_zemevudi_pelisid.pdf
    • http://gedow.radiatorpipes.com/uploads/1/3/0/8/130813420/telimot_javafowif_worona_beduretam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/sufogakukijaxawi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5689/6920/files/97440243217.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/vevarev.pdf
    • https://cdn.shopify.com/s/files/1/0432/0365/7887/files/59318111966.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1245/files/roluzoxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7912/files/bejunalenoperopuviviz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2222/0439/files/dl_91a.pdf
    • https://cdn.shopify.com/s/files/1/0447/3847/8229/files/business_communication_today_9th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/wobojikutajolamid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dijupabexapuvasazanuripik.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/56303023705.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13170590630.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c29b.bin
e0c629e75182624ecd1633a08c66c515e0b3e5a0ee39df0653143e0d72f31a12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC29B 5392 bytes
font_01_sfnt_off0000d4e8.bin
0ac71de38c93985738376f83607c43385369b2b92ab4d4c50a493eedf0c7aa90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 10332 bytes
font_02_sfnt_off0000f845.bin
d28b0db98c8c840a849eb707c12c5ebc9c120b80773bb08765c40bf9841d7fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 16508 bytes

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