Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0afbd6609b246d…

MALICIOUS

PDF

56.5 KB Created: 2020-07-30 15:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efdb93558b7e34c24260b156be378f95 SHA-1: 78328d2bda354591a9b0ce06c75f513b3a4fe0e1 SHA-256: bc0afbd6609b246d313a3bc231fe36c9ba32fc9c1959a6587f408d7edd04df7b
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates a direct link to malicious infrastructure. Additionally, 'PDF_SEO_LINK_FARM' suggests a large number of outbound links, likely to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=blister+in+the+sun+bass+tab+pdf
    • http://files.bombshellfinishingschool.com/uploads/1/3/2/6/132682802/wofejak-ridigopamobe-vurozag-kofifenuri.pdf
    • http://files.caledonianps.vic.edu.au/uploads/1/3/0/9/130969652/2584a8f4a2340.pdf
    • http://files.thesanctuaryatmn.com/uploads/1/3/1/8/131856184/d83262d07.pdf
    • http://files.thesanctuaryatmn.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32296476761.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/56049903463.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/bofemewakunafasabiguba.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/45981353590.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/41008973285.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/biduvob.pdf
    • https://cdn.shopify.com/s/files/1/0433/8873/1546/files/98507640899.pdf
    • https://cdn.shopify.com/s/files/1/0435/3874/3450/files/12634354451.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/pilixerunililegu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1149/files/14068297921.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2652/files/11127748777.pdf
    • https://cdn.shopify.com/s/files/1/0440/5706/7685/files/wunelidosimupanol.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/tiwukikalafosamewut.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_off00007b95.bin
9da57eb47d583bd3b6abb0f3ccc9e084cef6a3d4ec0d84c7b718aefb3d81f7a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B95 5088 bytes
font_01_sfnt_off00008cc3.bin
fcf6c51d97904bbc1b148651574f5bd4c18042866e26aacf4128674afb3fa0ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC3 15496 bytes
font_02_sfnt_off0000bd66.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD66 16204 bytes

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