Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d751c6326f40e06…

MALICIOUS

PDF

41.4 KB Created: 2020-08-25 14:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cf0aaa4796422cf283a2a1e6cadf7c1 SHA-1: 09b251cd2160c35e8d94d54982dd5fb3c6668d56 SHA-256: 5d751c6326f40e066d30e5b82b2606418faeff33d913969d5093d14a27cde97b
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for SEO spam and phishing campaigns. The document body, though heavily obfuscated, contains the target URL and appears to be generated by wkhtmltopdf, suggesting it was created programmatically. The presence of numerous external links, many pointing to Shopify, indicates a link farm strategy. No scripts were extracted, but the heuristic firings strongly suggest malicious intent via redirection.

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=bhairava+movie+video+song++hd
    • http://files.drmeladypreece.com/uploads/1/3/0/8/130813645/gamekafefim-lawutobolowo-kujowisopize.pdf
    • http://miverolu.mbaker-retail.com/uploads/1/3/1/3/131380771/f803563c8d33e.pdf
    • http://files.robertalberino.com/uploads/1/3/0/8/130814597/jokexuzibeguwal-gujimowupawadub.pdf
    • http://files.harchumanservices.com/uploads/1/3/1/8/131858044/dewikuwezoka.pdf
    • http://geags.com/18pafm
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/computing_the_variance_of_a_discrete_probability_distribution.pdf
    • https://cdn.shopify.com/s/files/1/0434/3965/3030/files/cancer_de_colon_peru.pdf
    • https://cdn.shopify.com/s/files/1/0437/5265/2951/files/xopiwirixunake.pdf
    • https://cdn.shopify.com/s/files/1/0436/3884/9694/files/radada.pdf
    • https://cdn.shopify.com/s/files/1/0431/5414/5444/files/como_convertir_grados_decimales_a_sexagesimales_y_viceversa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6775/8997/files/wg111_v3_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6667/files/tisasajoribev.pdf
    • https://cdn.shopify.com/s/files/1/0433/7611/5863/files/windows_batch_file_scripting_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/4915/5746/files/49767439118.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84005007378.pdf
    • https://cdn.shopify.com/s/files/1/0452/2446/0445/files/pigajib.pdf
    • https://cdn.shopify.com/s/files/1/0434/7366/6213/files/35331307850.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055c3.bin
f216eb67778c91a68d906f5f36f38aae406b91b603daf5b6c3719f5cb0eed58a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55C3 5024 bytes
font_01_sfnt_off000066a7.bin
2919755cbe417f487f9edae8e4babbbd144e2f77ddf927f627d68fb3b4e13167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A7 11000 bytes
font_02_sfnt_off00008abd.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ABD 4324 bytes

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