Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba728b9f8f6af94…

MALICIOUS

PDF

82.1 KB Created: 2020-08-26 12:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1935c450690d677d307ed971d8c5187 SHA-1: b05dbaa7aeb3405c3d9a35b28fc1913b2b696cb2 SHA-256: 4ba728b9f8f6af94dd3f55baa95c5819890867bd24099d9851a35b95def813e7
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL. This indicates the primary purpose is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=animal+farm+a+study+guide+student%2527s+book
    • http://zunamutaf.gmnstreetwear.com/uploads/1/3/1/3/131384260/xazufemuf_xexuvapumesa_memek_nasepa.pdf
    • https://cdn.shopify.com/s/files/1/0429/2047/6828/files/aihw_report_release_dates.pdf
    • https://cdn.shopify.com/s/files/1/0439/3464/6440/files/jovipufiwegasujujowudu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8114/5243/files/41944917197.pdf
    • https://cdn.shopify.com/s/files/1/0431/6351/7092/files/47269208977.pdf
    • https://cdn.shopify.com/s/files/1/0434/8972/2534/files/zuzafidupanagizexakowur.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/39351436357.pdf
    • https://cdn.shopify.com/s/files/1/0432/0398/5570/files/28499503582.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8757/files/kudutikurifotolomufum.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1770/files/sotagijegexineji.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/gotawav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11147191401.pdf
    • https://cdn.shopify.com/s/files/1/0459/8661/1357/files/bulixuseruxigozofedigusov.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_off0000f7f9.bin
4fd0264263b9b734088e4bb02caec647230c087461a07f760ddfe5b6fd0860df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 5436 bytes
font_01_sfnt_off00010a59.bin
3ee497ee4415d84ed474271820dbbc6c98daac6f003b18341695a35e89b1b01a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 10192 bytes
font_02_sfnt_off00012d3c.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3C 4324 bytes

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