Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d52a65abcaad76…

MALICIOUS

PDF

38.5 KB Created: 2020-08-07 01:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b5e3cdd505ae2485f50a4751fb2865c SHA-1: c14c5b41769b992fef9ab850115eccfa4707f4b6 SHA-256: a6d52a65abcaad760f58692b1cdbf6b9db2d52a914c6837a8c2b0358e625fcb0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=guru+graha+stotram+telugu+pdf' which is flagged as malicious. The presence of numerous links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute malicious content.

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.cc/pify?keyword=guru+graha+stotram+telugu+pdf
    • http://fibon.kabostudio.com/uploads/1/3/2/6/132681579/wikeditivupa-duxiwepi-wujuvo-gojupi.pdf
    • http://files.imasters-international.com/uploads/1/3/2/6/132695805/b13714710e9.pdf
    • http://files.acornhomeandgardenservices.com/uploads/1/3/1/4/131438682/41d3aa.pdf
    • http://files.enzorossisalon.com/uploads/1/3/2/6/132695280/sumagu.pdf
    • http://files.uk-racketball.com/uploads/1/3/0/7/130775505/rifokalijose.pdf
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/dopoworilijilukanozir.pdf
    • https://cdn.shopify.com/s/files/1/0432/8361/1801/files/lawanamefuxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/42281526496.pdf
    • https://cdn.shopify.com/s/files/1/0434/5203/9328/files/7800381941.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/assure_model_of_teaching.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/61663500180.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21533622499.pdf
    • https://cdn.shopify.com/s/files/1/0434/4954/8966/files/33011068749.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/ruvoperigivixulaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/canon_ir_advance_c5250_driver.pdf
    • https://cdn.shopify.com/s/files/1/0428/4193/1942/files/nigev.pdf
    • https://cdn.shopify.com/s/files/1/0436/1935/2739/files/belly_fat_loss_workout.pdf
    • https://cdn.shopify.com/s/files/1/0440/6142/5814/files/host_window_7.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_off00004f39.bin
7862a2d6530011fbac71b404ecd8e46ca4809e45c2b022da33f882fed049a6d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F39 5488 bytes
font_01_sfnt_off000061be.bin
8da4e5e83672b5b40f33b11e6e58e31d495b70b307793c5b004b2ed7ac637953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BE 13284 bytes

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