Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb5cab988258b12…

MALICIOUS

PDF

43.0 KB Created: 2020-08-23 10:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aca67c918bf5110fc6882a9f2c2bdb51 SHA-1: 177bb2590d24baf9d60b20a5df63c50fa5f49d20 SHA-256: 8fb5cab988258b127fac4354176fe2d1856eb7ca3962f9aa88c60cb88ba64d2f
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a construction company balance sheet. The document also functions as a link farm, pointing to numerous other PDF files hosted on various domains, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicates malicious intent.

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=construction+company+balance+sheet+pdf
    • http://zusaned.spirithorsetrc.org/uploads/1/3/0/9/130969204/dewedeterat.pdf
    • http://files.megwestphotography.com/uploads/1/3/1/6/131637649/kofakalamebamir-bufidosozunuxif-jugoma.pdf
    • http://xavepu.shantyshackbrewing.com/uploads/1/3/0/8/130814124/tivogawuwog.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6615/files/cursive_writing_alphabet_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/baganuvekobirupatemobosu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xiguxalenagidofivixonagez.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9273/files/95718530051.pdf
    • https://cdn.shopify.com/s/files/1/0431/8887/9521/files/94667051870.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/nozapaxemodasefifaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/91719148395.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/24766488256.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_off0000687c.bin
e2d65e3d22ee15065c800dd103238fd3482f32b3d18f1c7531f7bfa8db5c91ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x687C 5540 bytes
font_01_sfnt_off00007b24.bin
06af7071f841fe69d283a505a888b5ea984217c5860a02d9f1878b5127d85df7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B24 10668 bytes

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