Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3ac1ab6c3ba6eb…

MALICIOUS

PDF

42.9 KB Created: 2020-08-06 14:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f41a13af8350fcebfcda337f58780a03 SHA-1: cf8144ff910ce99efd5dd1a520d603034a83021a SHA-256: ca3ac1ab6c3ba6eb4d13fd047b42efd600ac4bdeeac807fd2b57695f5069e646
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'Chinese to English PDF translator free' and a URL that matches the malicious redirector. This suggests a social engineering attack aiming to trick users into visiting malicious sites.

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=chinese+to+english+pdf+translator+free
    • http://files.indoceylon.com/uploads/1/3/1/3/131384436/mogetijuzer_pibofaza_koxinaregu.pdf
    • http://files.mrsbhatiassage.com/uploads/1/3/0/8/130814124/zijefelexunoxadajoj.pdf
    • http://jokaw.artekcm.com/uploads/1/3/0/9/130969368/jiwidekopogo_fotadedotoji_fuxupowidorana_roselujogezi.pdf
    • http://files.armaeroconsultants.com/uploads/1/3/1/6/131607467/1610181.pdf
    • http://www.fotolia.com''gt;Fotolia
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/lowes_credit_card_bill_pay.pdf
    • https://cdn.shopify.com/s/files/1/0438/6082/0133/files/47065194146.pdf
    • https://cdn.shopify.com/s/files/1/0437/1175/8491/files/84006341493.pdf
    • https://cdn.shopify.com/s/files/1/0438/1959/7981/files/latirisuvidovezex.pdf
    • https://cdn.shopify.com/s/files/1/0431/4664/1570/files/26473408928.pdf
    • https://cdn.shopify.com/s/files/1/0435/7668/8798/files/38531721597.pdf
    • https://cdn.shopify.com/s/files/1/0428/1945/3095/files/95103240597.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1634/files/xaxiginori.pdf
    • https://cdn.shopify.com/s/files/1/0437/6916/8021/files/mocha_test_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0437/2194/9335/files/zoxobuluvemizuviz.pdf
    • https://cdn.shopify.com/s/files/1/0440/7456/5784/files/24024808590.pdf
    • https://cdn.shopify.com/s/files/1/0434/2480/9116/files/jpg_to_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/7560/0535/files/werexu.pdf
    • http://www.fotolia.com
    • 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_off000069c3.bin
ad9803af6ee01182df1aee4f07510613fe1cb41c2e74173ccc1f8b8e79b9b1b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C3 5208 bytes
font_01_sfnt_off00007b70.bin
fd1a0eab38df990ca9cf69fff59b6f0c1293f3c75dd34f1ace81fa6eb0c11d78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B70 10072 bytes

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