Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d835fc2432e9c89…

MALICIOUS

PDF

46.0 KB Created: 2020-08-05 03:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c436abdf3037a8cfb3517e9e90573e41 SHA-1: 629e8360ff76984b45a4292666da0af76486efc2 SHA-256: 4d835fc2432e9c89f1db3934c2980f64d2927d0d1e8f8c355b6f6d9ab2d7d585
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to malabsorption syndrome. The PDF also hosts a large number of other PDF files, suggesting a link farm or content stuffing technique to improve search engine ranking and visibility.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=sindrome+absorcion+intestinal+deficiente+pdf
    • http://files.awakendancetheater.com/uploads/1/3/2/7/132740488/c8b5436a64cf.pdf
    • http://files.artlounge1.com/uploads/1/3/1/4/131407571/237587.pdf
    • http://files.kruisinkanines.com/uploads/1/3/2/7/132741571/dejipazi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1725/4558/files/45457156433.pdf
    • https://cdn.shopify.com/s/files/1/0432/6214/8763/files/8323347295.pdf
    • https://cdn.shopify.com/s/files/1/0438/4768/0162/files/dafum.pdf
    • https://cdn.shopify.com/s/files/1/0437/6382/6849/files/mafogusibolo.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2173/files/taxation_and_agrarian_reform_in_the_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0430/8638/1210/files/27875742274.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2588/files/weralenerarer.pdf
    • https://cdn.shopify.com/s/files/1/0432/8869/0844/files/lebakovabogese.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/lixizudekenemavulogi.pdf
    • https://cdn.shopify.com/s/files/1/0447/6986/9975/files/lonely_planet_bali.pdf
    • https://cdn.shopify.com/s/files/1/0431/0886/0065/files/18895253795.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.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_off00006781.bin
28584c7cdb07dae2eb12217713856a0aff6f633f2b2020ce9a9f8a23ff2d13a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6781 5332 bytes
font_01_sfnt_off0000796f.bin
9dfd89f282e94a1d6b691beea0a22d011df56f98066b26d87f202dd6d217cd17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x796F 10376 bytes
font_02_sfnt_off00009cd6.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CD6 4324 bytes

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