Malicious PDF — malware analysis report

Static analysis result for SHA-256 b543bec870f7cc17…

MALICIOUS

PDF

43.6 KB Created: 2020-07-08 17:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a4c7d4fd868a7b30cb7b17880e1bf12 SHA-1: 5f0671d880e8d101ea32e825137439d0dc6f3d9b SHA-256: b543bec870f7cc1741ec6b1e7df8a0942fd84e4e6edabec366e5a85fe513b8da
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector, 'https://ttraff.cc/wb?keyword=pdfelement%206%20pro%20ocr%20plugin%20download', which is indicative of a phishing or malware distribution attempt. The document body and numerous extracted URLs suggest a link farm designed to host or redirect to malicious content, likely for software piracy or malware delivery. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=pdfelement%206%20pro%20ocr%20plugin%20download
    • http://files.eastafricanscholarsfund.org/uploads/1/3/0/7/130776718/vemofuva.pdf
    • http://files.stupedhillbilly.com/uploads/1/3/0/7/130776567/jojuzotanirixuv-relesotogugi-xogix-nugokap.pdf
    • http://files.eugenemontgomery.com/uploads/1/3/1/4/131438766/zesolabugilobe.pdf
    • http://files.theskinthatburns.com/uploads/1/3/1/1/131164534/f66e7e2f6bf.pdf
    • http://files.seizediem.com/uploads/1/3/1/4/131438741/vewim_gifesimefipotu.pdf
    • http://files.sarahthurstensondesign.com/uploads/1/3/0/7/130739069/9421336.pdf
    • http://files.newyorkstategrandcouncil.com/uploads/1/3/1/4/131437538/bapemo.pdf
    • http://files.blazesolar.ca/uploads/1/3/1/3/131384539/7120887.pdf
    • http://files.finalfinishdetailing.com/uploads/1/3/2/7/132710655/levin_linebedanelu_vidaki_vukadidi.pdf
    • https://vawejala.files.wordpress.com/2020/07/10632828279.pdf
    • https://nugakizapu287319484.files.wordpress.com/2020/06/sekopinadut.pdf
    • https://fatovebuxi.files.wordpress.com/2020/07/26871482422.pdf
    • https://panezurazid.files.wordpress.com/2020/07/93825234504.pdf
    • https://gamumibas.files.wordpress.com/2020/06/28006254597.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97697777452.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86556218032.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tedogunugovosilogupex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.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_off000069fc.bin
673aa65802a91a25369bec3d6f6f2ee57ec6525fd6afeee4b392ac895f6c39e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FC 5428 bytes
font_01_sfnt_off00007c61.bin
943d157f3fb9d6c74427fe83e8559bd0a3e559cbae800f1fd991df035f175eee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C61 11496 bytes

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