Malicious PDF — malware analysis report

Static analysis result for SHA-256 618bf8d159cf331d…

MALICIOUS

PDF

43.7 KB Created: 2020-08-24 21:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b6d2b0391076b815650ea4f00f2dde2 SHA-1: 1332f373cb0bfb1f288450830f0ea28c112c2096 SHA-256: 618bf8d159cf331d75db9f8461892bd170c34b353558de53bd45a2bd27bfccd0
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to a redirector infrastructure, suggesting a link farm or phishing campaign. The presence of a "download" button and an explicit instruction to disable security software indicates a malicious intent to trick the user into downloading further content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=autocad+map+3d+software+free
    • http://files.creedewoodcarvers.com/uploads/1/3/1/6/131606435/002363620.pdf
    • http://files.westminsterbbic.org/uploads/1/3/0/8/130814706/7376d9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/8107/8686/files/70915584767.pdf
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/pixinopimitapofaxabimo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9671/0047/files/definicion_de_trastorno_alimenticio.pdf
    • https://cdn.shopify.com/s/files/1/0436/3101/8142/files/first_and_last_name_generator.pdf
    • https://cdn.shopify.com/s/files/1/0431/6961/1930/files/yakuza_kiwami_2_mahjong_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3302/files/dedisiwakoxigokerus.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/72927986031.pdf
    • https://cdn.shopify.com/s/files/1/0431/8402/9854/files/62950379125.pdf
    • https://cdn.shopify.com/s/files/1/0429/3961/3347/files/ledirerogep.pdf
    • https://cdn.shopify.com/s/files/1/0431/5342/4540/files/comethazine_walk_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0434/1530/6405/files/napak.pdf
    • https://cdn.shopify.com/s/files/1/0436/1116/0738/files/dolerowukin.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6690/files/69708752896.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_off000065aa.bin
87f624b6309d4eba270147429658536e6da3d45e6128f70a8005ee23ab7d5076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65AA 5516 bytes
font_01_sfnt_off00007861.bin
1a5e62aace8279854fc1572247e9aed1e67accbe6fe34558614fa3ca4bff7acf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7861 13052 bytes

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