Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cd4981fb0c7b76…

MALICIOUS

PDF

35.5 KB Created: 2020-08-09 06:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7d0b5934302ff53c770dc8778297353 SHA-1: 9b94f3dc71368aadffd0a053da4a833ed977e172 SHA-256: d2cd4981fb0c7b76c16a0cfaa07f1bb39bdc3999cb4ed44597edaf90d46a0a06
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as 'anatomy handouts pdf' and a large farm of external PDF links, likely to manipulate search engine results or distribute malware. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=anatomy+handouts+pdf
    • http://files.yaldocargo.com/uploads/1/3/1/3/131382387/rokozazelogu_tozoto_xatugipewikat_vibanejid.pdf
    • http://files.emilyeichmeier.com/uploads/1/3/1/3/131378918/rawutisobip-vegoso.pdf
    • http://files.camanchemobilehomeparks.com/uploads/1/3/1/3/131384145/fefizojepopubatidake.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/55183265124.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/potulebi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/zerebuvagenu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0937/5383/files/63917720106.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/36906747059.pdf
    • https://cdn.shopify.com/s/files/1/0449/1057/5771/files/ad_d_chronomancer.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/alcohol_phenol_and_ether_ncert_solution_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5426/0633/files/gungeon_bubble_blaster.pdf
    • https://cdn.shopify.com/s/files/1/0435/6590/8123/files/75303143844.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/90510547140.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/vernier_caliper_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0447/5686/1077/files/work_smarter_not_harder_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/baidu_map_api.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e33.bin
29ea35ea39c37920a03a2994150716e69c6c626e895fd96d2e55aba9157cfeba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E33 5244 bytes
font_01_sfnt_off00005ff4.bin
4fd0b5d574215d5591e6e805615cb28e27634b7f7c7497c8267922783004b712		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF4 9852 bytes

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