Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9e16626ec7dbe2…

MALICIOUS

PDF

39.7 KB Created: 2020-08-10 09:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e59b475ffaf6bfbb96929c68d958c6ea SHA-1: b4abcf7ad96a8aeb437134ae2f0b74fa8a2f0166 SHA-256: 1d9e16626ec7dbe2be888b2525a99a4adf624acc2927f28a862eeae9f340ec0c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external resources disguised as PDF files. One of these links, https://ttraff.ru/pify?keyword=detailed+map+of+china+pdf, is identified as a malicious redirector. The document body also contains this URL, suggesting an attempt to lure users to malicious sites under the guise of providing information. The ML classifier strongly supports the malicious nature of this PDF.

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=detailed+map+of+china+pdf
    • http://buwog.innuan.org/uploads/1/3/2/6/132695569/jebupusoj.pdf
    • http://xukavu.kathyschrock.net/uploads/1/3/1/3/131398091/vodevunasobos-vuvoru-buxifatolaxoda-wukozejipo.pdf
    • http://lexeredem.nextgenindy.org/uploads/1/3/0/8/130814229/korotolobalizozu.pdf
    • http://xorit.foodrefusal.co.uk/uploads/1/3/1/3/131383544/tasijorazeg_fewid.pdf
    • http://jexixisu.body-balancing.com/uploads/1/3/1/0/131071252/530522.pdf
    • https://cdn.shopify.com/s/files/1/0435/4555/9189/files/game_of_thrones_avclub.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7483/files/buscopan_gts_bula.pdf
    • https://cdn.shopify.com/s/files/1/0428/4583/1324/files/xomejumabelabupi.pdf
    • https://cdn.shopify.com/s/files/1/0438/8729/6680/files/tasebemijobexuvixipeve.pdf
    • https://cdn.shopify.com/s/files/1/0438/4758/1856/files/caiib_advanced_bank_management_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/vazejumopavasup.pdf
    • https://cdn.shopify.com/s/files/1/0431/8104/7965/files/67015342560.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6157/files/vowigixulazolarovovizita.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/bhagwat_puran_sanskrit_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4208/5783/files/womixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/63478379795.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/nesoxugegajug.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_off00005ce4.bin
0775e3eb6da9e3867da1293952c6c8db6a63cef335cdc1c860dea5f7e3cfe0ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE4 5120 bytes
font_01_sfnt_off00006e37.bin
aca48206d3b3a8a469088f674d6270104b3b210d41cb8215a74e0a66c791876a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E37 10432 bytes

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