Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4321712fe292f34…

MALICIOUS

PDF

54.6 KB Created: 2020-07-31 04:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a2ce9653d41cb7fdce43a505c706396 SHA-1: fbeb721135b19dbbddb875dc2a65208cdb2015ae SHA-256: a4321712fe292f344343bed05fc958a0b580051b0aabe7586b127e21754c8e2a
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.ru'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, indicating the PDF's primary purpose is to lure users to malicious sites. The 'PDF_SEO_LINK_FARM' heuristic suggests a large number of outbound links, likely to obscure the malicious destination or for SEO manipulation. No scripts were extracted, but the presence of malicious redirector links strongly suggests a phishing or malware delivery attempt.

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.ru/pify?keyword=renal+stone+%25E0%25B8%2584%25E0%25B8%25B7%25E0%25B8%25AD+pdf
    • http://files.burgundyproductions.com/uploads/1/3/1/4/131483108/rilufuso.pdf
    • http://files.centennialconcrete.org/uploads/1/3/0/7/130740207/fogupokow_zerarozozefon_dibivamo.pdf
    • http://files.adcserv.com/uploads/1/3/1/4/131412558/pubudefaru.pdf
    • http://files.sacramentomedicalspa.com/uploads/1/3/0/9/130969934/6484145.pdf
    • http://files.adcserv.com/u
    • https://cdn.shopify.com/s/files/1/0437/4442/8181/files/61209465242.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5906/files/kesenavaviduxobinotisisa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0630/4166/files/rupapoxevuvof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdf
    • https://cdn.shopify.com/s/files/1/0440/4409/1557/files/43221167188.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4023/files/38377412471.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/bigivetegoraxoginapes.pdf
    • https://cdn.shopify.com/s/files/1/0432/4311/0555/files/17211699092.pdf
    • https://cdn.shopify.com/s/files/1/0428/1463/6198/files/24240743454.pdf
    • https://cdn.shopify.com/s/files/1/0436/9691/4586/files/47228485287.pdf
    • https://cdn.shopify.com/s/files/1/0434/6383/5814/files/11783509001.pdf
    • https://cdn.shopify.com/s/files/1/0431/2953/6676/files/sulovemogal.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/26158214551.pdf
    • https://cdn.shopify.com/s/files/1/0435/4179/0871/files/41071561129.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000872f.bin
1687b3d3b421d7b7f42526989d2a27d0e49bfcdd22f46242050645967281e8b6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x872F 11292 bytes
font_00_sfnt_off00006736.bin
8cdb82fa1bd055b2a983f0cf866890d2e5ad2593c49677e6dc40a2dae42b1863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6736 4684 bytes
font_01_sfnt_off00007731.bin
96a6b1aca62ce964ce1a7f0f1d699b36a218f8ea7d340becdfd918ff57d46c02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7731 6180 bytes
font_03_sfnt_off0000a726.bin
132bd4d94ff24feb8cdf305757a4929ca61655e218ff4fbe1e60587f26f9cdee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA726 10360 bytes

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