Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7476d73fb890524…

MALICIOUS

PDF

45.9 KB Created: 2020-08-31 11:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dee4b979034a96692d0b984134362d55 SHA-1: e2caf0096cba30fd70545a3c51cf22dc216f2d07 SHA-256: f7476d73fb8905247bcd5e51f67181a18b7d10f296685cbc2325c4f4d5bd00a7
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'unikey 4.2 rc1 32bit' and 'wkhtmltopdf', suggesting a potential lure or exploit context. The presence of a malicious redirector at ttraff.com indicates an attempt to lead the user to a harmful destination, likely for phishing or malware delivery. 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.com/wix?keyword=unikey+4.2+rc1+32bit
    • https://cdn.shopify.com/s/files/1/0439/4916/2654/files/clear_steam_cache.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/goxolunosidabokolenozipi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4190/files/xekusosefipid.pdf
    • https://cdn.shopify.com/s/files/1/0461/7633/8073/files/ejemplos_de_una_metodologia.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/35460030947.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7462/files/37410354552.pdf
    • https://cdn.shopify.com/s/files/1/0464/6495/8616/files/mamapinekukepu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4735/3511/files/13787513978.pdf
    • https://cdn.shopify.com/s/files/1/0429/8830/6586/files/week_number_calendar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/1546276718.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/alfresco_open_source_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/6455/5675/files/46290416263.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/48310875504.pdf
    • https://cdn.shopify.com/s/files/1/0435/6849/6798/files/60506180586.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/buxem.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6059/files/sadolemukinuvikinawumi.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_off00006524.bin
a6c21d319e822dabdc6a985f1a343e4cebebf65ca99a424a5bcf3699e5bdb560		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6524 4816 bytes
font_01_sfnt_off000075a7.bin
2f21cc73770b79b88c61e58d32e0f2e2a1e0c101611a9f6da880fc4eb7d82a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A7 13348 bytes
font_02_sfnt_off00009ca2.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA2 4324 bytes

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