Malicious PDF — malware analysis report

Static analysis result for SHA-256 19540dccd243f63c…

MALICIOUS

PDF

43.5 KB Created: 2020-08-05 01:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c326d56b2e4ae9e2155744322f255649 SHA-1: 5553020a760af5720943249d2588d8999f5bf059 SHA-256: 19540dccd243f63caf3450c139c545e215faf4ca3815b405ab187050d678d13f
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 distributing malware or phishing pages. The document body, though heavily obfuscated, contains text related to 'pharmacology ebooks free download pdf' and a URL that aligns with this lure. The presence of numerous external PDF links, many pointing to benign Shopify domains, suggests a link farm or SEO manipulation to improve search engine ranking for the 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=pharmacology+ebooks+free+download+pdf
    • http://files.keepcalmandkickals.com/uploads/1/3/0/8/130874058/7650393.pdf
    • http://files.rigodistrict.com/uploads/1/3/1/0/131069934/7fb952cebeb96.pdf
    • http://files.yukonriverdesigns.com/uploads/1/3/0/8/130813818/089609dbe3b938.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9060/0355/files/lamometitewetomuvitopet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0629/5196/files/signals_and_systems_oppenheim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/texigusowemojegovivek.pdf
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/tratado_de_direito_penal_bitencourt.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/zadisitofaxu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8189/8913/files/tuloruvimodozadadonikiwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4879/6309/files/mevevexuwiwimuregegukim.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4677/files/migoxejezigemodivesoxalo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/83143849842.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9352/files/33046929085.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/42403546434.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/48147185646.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nomevorijodasulalo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2190/0696/files/phonetic_sounds_of_english_alphabets.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_off00006aaf.bin
1b37ea0497dd1d332a1da782f5e1e28e388218c2581d37e5679c8d279810358f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAF 5968 bytes
font_01_sfnt_off00007eee.bin
df5c75c343b5b7867fc7e1f5c3cd0a6356d692de35e8ffbd5e209575647eac91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEE 9832 bytes

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