Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f3800449afee72…

MALICIOUS

PDF

38.6 KB Created: 2020-08-28 10:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1165e066505c3edb413d66a6ae7caee6 SHA-1: 7b4ca5b19e48fbde5d542084deb89803803149d9 SHA-256: f8f3800449afee725e02cc9234425f8c661b4fd97abea5675dc86fc5e55de69d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring the user to a malicious site via the embedded link.

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=oxford+picture+dictionary+english+tu
    • http://files.the-mad-scientist.net/uploads/1/3/0/7/130739947/zizoxa_kabimabivarepe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8281/files/radojiwofub.pdf
    • https://cdn.shopify.com/s/files/1/0448/4156/6370/files/ashrae_ventilation_standard_62._2.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6343/files/bollywood_actress_hd_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/20617210231.pdf
    • https://cdn.shopify.com/s/files/1/0432/9770/2046/files/internship_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0440/9986/2680/files/76789871778.pdf
    • https://cdn.shopify.com/s/files/1/0441/4350/9656/files/top_anime_opening_songs.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/76963067838.pdf
    • https://cdn.shopify.com/s/files/1/0428/3885/1751/files/android_backup_service_apk.pdf
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/pokekiwojul.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_off00005842.bin
f7fa2e29a8513caa04b4dba6934bcf7685d6547ae4dd611273bd0e1707c12bb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5842 5616 bytes
font_01_sfnt_off00006b69.bin
887806f2e0285ae3b869415be433633180135e6e01499eb1e140e76ff2cc6e96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B69 10068 bytes

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