Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df03365a6aa1d40…

MALICIOUS

PDF

34.6 KB Created: 2020-08-13 03:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0697d81e369ccf5d2ea04e819a4ab33e SHA-1: c53341b2590512f812b7538e67c31b1fdb44818a SHA-256: 7df03365a6aa1d409df7f2aca7ba8bbc465be796fe814cdf287ff1cf90532c71
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates malicious intent. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly benign PDFs. The document body, though heavily obfuscated, contains the malicious URL and other embedded links.

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/wb?keyword=vermont%20gage%20pdf
    • http://files.thedwnews.com/uploads/1/3/1/1/131164118/63388646cb9.pdf
    • http://files.gettinoutdoorsradio.com/uploads/1/3/1/0/131070501/3498424.pdf
    • http://files.flagman-communications.com/uploads/1/3/2/7/132740181/sibanumevubafu_bonowitoxus_piziderujexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0870/4164/files/xitutevekij.pdf
    • https://cdn.shopify.com/s/files/1/0437/3427/0117/files/blob_tree_printable.pdf
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/11036360218.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6582/files/reddit_dic_pics.pdf
    • https://cdn.shopify.com/s/files/1/0441/4128/1432/files/visa_bulletin_2016_predictions.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/lazuxezajavof.pdf
    • https://cdn.shopify.com/s/files/1/0441/2948/4952/files/capture_an_entire_web_page_as_an_image_or.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/3247671194.pdf
    • https://cdn.shopify.com/s/files/1/0447/8540/2013/files/marathi_katha_kadambari_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/9426/8320/files/blank_space_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/tulasuxujilukorubazoma.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/ronafipaxabisigozetut.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3142/files/gijekagasej.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_off00004a18.bin
24dababf396836c01da190d2e1e039394a045dc6bb3ab4ca5b1480277c50ef44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A18 5116 bytes
font_01_sfnt_off00005b6d.bin
7092638066daa0d854528e79432e5f8084864ec4ac96eaf57b8ae4492f619af8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6D 10104 bytes

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