Malicious PDF — malware analysis report

Static analysis result for SHA-256 808992f7d23a3c4c…

MALICIOUS

PDF

47.7 KB Created: 2020-08-02 10:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dabb7c89eac5a0682977a4c0bff7fbba SHA-1: e65466f28d06a73c17880b3b0ed5ebfd8a8a6146 SHA-256: 808992f7d23a3c4c3f24559f982c45fcb98398f1a619d15bcddcc21b9fc9ceb9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that likely serve as lures to further malicious content or phishing pages. The presence of many Shopify links suggests a link farm tactic to improve SEO for malicious content.

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/pify?keyword=fleetguard+filter+cross+reference+pdf
    • http://files.botanicalchildren.com/uploads/1/3/0/7/130738971/f8e8d01cad4f.pdf
    • http://files.shefunilax.com/uploads/1/3/1/4/131408798/087f90399e3.pdf
    • http://files.estherwayne.com/uploads/1/3/2/7/132740291/9042839.pdf
    • http://files.q2ten.com/uploads/1/3/2/6/132683246/c0a9102.pdf
    • http://files.nigellewisphotography.com/uploads/1/3/1/8/131871740/ed3a44a475.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/open_in_paint.pdf
    • https://cdn.shopify.com/s/files/1/0428/9947/2550/files/javascript_trim_whitespace.pdf
    • https://cdn.shopify.com/s/files/1/0434/3513/1046/files/3330429278.pdf
    • https://cdn.shopify.com/s/files/1/0433/5245/7369/files/tebokagokunizi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4044/files/1757610854.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1121/files/fojozipivunivisatotutu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/begusonupenasisuxemipudat.pdf
    • https://cdn.shopify.com/s/files/1/0436/8151/3622/files/39169783900.pdf
    • https://cdn.shopify.com/s/files/1/0435/7593/5135/files/tekalafirumumevu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8148/9813/files/zuxovisarixivovukiniwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5156/4707/files/loxakasafasu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6483/6764/files/brew_install_apache.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005483.bin
68f8493751183617e908d31e85c8024e4e465e7f0e9c38934f7927d6c8bf74ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5483 4032 bytes
font_01_sfnt_off000062db.bin
b21271643fa002759cf0f0c694cbc7dcfabf6828aa88f7ba0f4d028233e6b53b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62DB 5276 bytes
font_02_sfnt_off000074e6.bin
b2afe2e579b2fbdd1e93dea0cd566fb4edd083ff86c4b5e49a5df44da32c6de6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E6 10196 bytes
font_03_sfnt_off000097f6.bin
fe1ca6a691315ef32827512bb86cd3188d7c30cfa02bd4559714794831c9b14a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97F6 16684 bytes

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