Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1aab05696b55de…

MALICIOUS

PDF

40.4 KB Created: 2020-08-21 02:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24d57c25ca6224db2452869d9136fe87 SHA-1: f5f6243d4b6e75c1c9b162b0ed6358fa1feb986e SHA-256: bb1aab05696b55def8f48ecd771c9f8b4e080a016c46a9744abd4240043e1e4f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=mapa+buenos+aires+google+maps', which is flagged as a malicious redirector. This suggests the PDF is designed to lead users to malicious content through a 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=mapa+buenos+aires+google+maps
    • http://dupupani.valeriesplayhouse.com/uploads/1/3/1/6/131606490/zilatur_viwaxazetuk.pdf
    • http://novenosom.mindfulheartprograms.com/uploads/1/3/0/7/130739287/zirigulorixawa.pdf
    • http://nenop.saisoccer.org/uploads/1/3/1/3/131380005/149ef.pdf
    • http://files.hammocksforhappiness.com/uploads/1/3/0/8/130874683/vesiteduwipeda.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/litoweligemunerazuboki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9198/files/cost_accounting_101.pdf
    • https://cdn.shopify.com/s/files/1/0451/3621/6229/files/icy_veins_mistweaver_talents.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1871/files/building_construction_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/wiviv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3604/files/panajovegibabixel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0635/2804/files/36558006497.pdf
    • https://cdn.shopify.com/s/files/1/0437/2342/3912/files/37213179115.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5063/files/leremarulum.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/10869497715.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000534a.bin
5a6cf5dbef0c5f763766e228ce736fc6c49581c03fe5881c547e36220aef9df4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x534A 5088 bytes
font_01_sfnt_off0000646b.bin
09d5b9e03dd37b9297f1f6068fe6d50c84e658341d553d513665d7c6ba02d863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646B 10384 bytes
font_02_sfnt_off000086c3.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C3 4324 bytes

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