Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e57418dc3fe2bd…

MALICIOUS

PDF

42.7 KB Created: 2020-08-09 17:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20fdf13a6bbd9c10aa286e629c83169f SHA-1: 0e9003bfc04ab722c011e3e593554193a6d54b4e SHA-256: d7e57418dc3fe2bd8a8e6fb09004952acadeb46e6ee5cad5803c6d6d42cad7f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Effective communication skills pdf great courses' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious nature of this PDF.

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=effective+communication+skills+pdf+great+courses
    • http://files.masterclassbudapest.com/uploads/1/3/1/3/131398259/delirobufukoxis-rudovizikelex-nulomigeforudid-kulapenefeba.pdf
    • http://files.sdsimages.com/uploads/1/3/2/8/132815752/1413500.pdf
    • http://files.akbeadsociety.org/uploads/1/3/2/6/132696104/kafiginujapokawez.pdf
    • http://files.tymprojects.site/uploads/1/3/2/8/132815206/jibomatodedake.pdf
    • http://tiwim.biglittlethingsfoundation.org/uploads/1/3/1/6/131607131/tamizi_jemugizitoruf.pdf
    • https://cdn.shopify.com/s/files/1/0429/4639/6326/files/27879072464.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/sekiro_mask_fragment.pdf
    • https://cdn.shopify.com/s/files/1/0432/3291/9720/files/asrock_z370_pro4_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8746/2551/files/85235707437.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/7912569174.pdf
    • https://cdn.shopify.com/s/files/1/0439/3933/2251/files/adp_self_service_portal.pdf
    • https://cdn.shopify.com/s/files/1/0437/8548/6485/files/33182591038.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/jevugesisikoguxewewefozaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/4553/5400/files/mathematical_biology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1981/files/28170333404.pdf
    • https://cdn.shopify.com/s/files/1/0432/0182/2875/files/kibopovidokujulumoja.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/19114919119.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lamafavikunidamekisuf.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000679a.bin
a76bb3d740d6f22457c927c388994621cf59c27c0e4c58f779f06a7dbbc60f98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679A 5556 bytes
font_01_sfnt_off00007a7e.bin
64c7014c3e962edf0aa012563b1d5d44e8098c5db8125bce992a93d06d946d00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7E 10180 bytes

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