Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b43e9628bfe66f7…

MALICIOUS

PDF

41.0 KB Created: 2020-08-27 20:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52508cedd44db90ae0484d30040655a1 SHA-1: 96b238a333b8ce705282aa4299ddee04f7ea1376 SHA-256: 0b43e9628bfe66f70c3204bbf447dee0c2abc4de5c7b9ebadf86d4032bc24b4a
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the text 'bdo black spirit forms' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of many PDF links, some benign and some malicious, indicates a link farm strategy. No scripts were extracted, but the PDF structure itself facilitates the malicious 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.link/pify?keyword=bdo+black+spirit+forms
    • http://files.renatalynn.com/uploads/1/3/1/3/131384359/bagedoxep-molatusazis-jukopa-felovadopeve.pdf
    • http://files.highdesertfilmlocationsla.com/uploads/1/3/1/8/131856247/kilukugalinoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/zajugefanawuvera.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/eslint_style_guide_airbnb_vs_google.pdf
    • https://cdn.shopify.com/s/files/1/0428/9455/7347/files/vagomulebuzomomuxizenizi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4383/1464/files/62708315982.pdf
    • https://cdn.shopify.com/s/files/1/0447/9824/7078/files/eyiz_listesi_detayl.pdf
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/loxatijutadubanig.pdf
    • https://cdn.shopify.com/s/files/1/0434/1337/3084/files/zifedujaxujex.pdf
    • https://cdn.shopify.com/s/files/1/0429/2080/4511/files/website_development_tutorials_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/38488594540.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3835/files/gantt_excel_template_2019.pdf
    • https://cdn.shopify.com/s/files/1/0430/6114/9850/files/telecharger_badoo_apk_pour_android_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0439/3949/6094/files/brandy_another_day_in_paradise_remix.pdf
    • https://cdn.shopify.com/s/files/1/0435/1285/6731/files/kuzojidibibobal.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_off000060d3.bin
fadc865e645d6cd6d384d5c76d331a0b75c6370e0bad09c5d533bd923d98adfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D3 5552 bytes
font_01_sfnt_off00007399.bin
27f3ea1514ad1f251a20316a9d15e87a424c65ddded8cad0f5ddb2f42869c328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7399 11040 bytes

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