Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b419b431ac94df2…

MALICIOUS

PDF

39.1 KB Created: 2020-08-11 23:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2002ffc9a990380b62f250af1cca0ba9 SHA-1: 67f0ecce4d89ff5084dc4dfb6bba902736a4ea67 SHA-256: 6b419b431ac94df2fd73f79172c5b39a54253f169cbc361260cfd3c4f2ddf464
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass external link farm, with one URL leading to a known malicious redirector. The document body, though heavily obfuscated, contains the text "Certificate of incorporation kenya pdf" and the malicious URL, suggesting a lure to trick users into visiting a phishing or malware distribution site. The presence of numerous PDF links indicates an attempt to generate traffic or distribute further 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.com/pify?keyword=certificate+of+incorporation+kenya+pdf
    • http://files.actoncommunitychorus.org/uploads/1/3/0/8/130813841/d968f.pdf
    • http://files.killjoy.info/uploads/1/3/2/8/132816158/444fa6d86d0810f.pdf
    • http://borunap.sundanceengland.com/uploads/1/3/2/6/132695829/df288c058a8.pdf
    • http://files.detranslations.com/uploads/1/3/2/6/132682806/98495.pdf
    • http://files.hotrodtrailersales.com/uploads/1/3/0/7/130775221/dd53d788cf00d08.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8587/9713/files/39861199494.pdf
    • https://cdn.shopify.com/s/files/1/0430/2818/5239/files/zidimix.pdf
    • https://cdn.shopify.com/s/files/1/0432/4465/0651/files/57199840273.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/dojarivivewopu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/69386165547.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7900/files/57831727390.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/nigedusarubipumo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5454/files/merapupemarako.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6725/files/ruwizavexubowo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4143/8366/files/xeseligojituwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4876/2529/files/bonafide_certificate_pdf_for_scholarship.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/lezopafajafupesukizade.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a73.bin
6e4bc8fd612e42b78b738a133bd6b448c6252a20266a0867242f82725bfa7399		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A73 5008 bytes
font_01_sfnt_off00006b92.bin
549b2513aef4d825c2dfdbb2353c4409b51ce921f84f27c099efc73911c9b3d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B92 10464 bytes

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