Malicious PDF — malware analysis report

Static analysis result for SHA-256 638fcbcef6eaa834…

MALICIOUS

PDF

144.5 KB Created: 2020-08-08 17:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54cdfd4db8ec1955479a6fb792d4c8ea SHA-1: 682f5b1519ca20aa255c5b98463f34e328682b78 SHA-256: 638fcbcef6eaa834eeff66fa0ace6cfd752e1c568d4f974677b31a62db657f12
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a search result for a document download, which redirects to a malicious URL. The presence of numerous external PDF links suggests a link farm designed for SEO manipulation, likely to host malicious content or redirect users to phishing sites. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/pify?keyword=assam+census+2020+pdf+download
    • http://files.w300ak.com/uploads/1/3/0/9/130969489/sefomixusuriniru.pdf
    • http://files.kapturlight.com/uploads/1/3/0/9/130969097/65c10.pdf
    • http://files.widebaydancesupplies.net/uploads/1/3/1/3/131398308/tutupogomimuv-katofopubo-ligowaw.pdf
    • http://files.ustbonifacefafs.com/uploads/1/3/1/4/131483275/959b49595.pdf
    • http://files.silverstormfarm.com/uploads/1/3/0/7/130740231/8451747.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xikidewutuxazumal.pdf
    • https://cdn.shopify.com/s/files/1/0433/8148/9829/files/walofunutedexakep.pdf
    • https://cdn.shopify.com/s/files/1/0449/5484/5352/files/unity_object_pooling.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/abdominal_aorta_branches.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdf
    • https://cdn.shopify.com/s/files/1/0433/9010/7815/files/pedagogia_definicion_segun_autores.pdf
    • https://cdn.shopify.com/s/files/1/0432/8131/8056/files/couper_un_doc_en_deux.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/general_election_to_lok_sabha_2020_annexure_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3907/files/xemosakudowageguron.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/anaconda_prompt_commands.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/91197629737.pdf
    • https://cdn.shopify.com/s/files/1/0438/5954/2176/files/development_economics_journal.pdf
    • https://cdn.shopify.com/s/files/1/0437/6484/2647/files/bimolecular_collision_theory.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d981.bin
a51a1366bf0ab2582f2f4a29aa063825045e499a2888edbd7012c402608bf5e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D981 5560 bytes
font_01_sfnt_off0001ec75.bin
68f0ad5ac73150dffea0417dc2c8e76e09c51175a6a1d316de3d77cd64b831b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC75 16208 bytes
font_02_sfnt_off00021e14.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21E14 16164 bytes

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