Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed5ff9aa3bb1591…

MALICIOUS

PDF

39.8 KB Created: 2020-08-17 01:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23873ad3f924177bc95c5553d331bb69 SHA-1: 2f10ef775b7998c3ed666bf01412b32ecf43117d SHA-256: 6ed5ff9aa3bb1591a8ea259f55fd8c952a34b048a636687f534c3c66ca7a6d1f
162 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. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content. Although no scripts were directly extracted, the PDF structure and embedded links suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=wedding+coordinator+contract+template
    • http://files.stand2serve.org/uploads/1/3/1/4/131483138/7382014.pdf
    • http://bedalani.pottawattamiecountydemocrats.com/uploads/1/3/1/4/131438641/3903497.pdf
    • http://files.house-removals-surrey.info/uploads/1/3/0/9/130969985/bubid-wefedax-jijixozirut-warafoburade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7778/8057/files/english_story_for_reading.pdf
    • https://cdn.shopify.com/s/files/1/0431/8730/6658/files/norma_culta_e_variedades_lingusticas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.pdf
    • https://cdn.shopify.com/s/files/1/0438/1632/1184/files/kuwemosoxijegatimopira.pdf
    • https://cdn.shopify.com/s/files/1/0431/4605/1744/files/71135851273.pdf
    • https://cdn.shopify.com/s/files/1/0453/2790/9019/files/rudram_namakam_telugu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/3086/1208/files/22607654073.pdf
    • https://cdn.shopify.com/s/files/1/0428/7227/5103/files/xozateropusimozigo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/myocardial_infarction_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mevebetivegukubevam.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_off00005f5f.bin
c74f84cc734186f632feaa3828ea95cd6b31f75c5ce0322e7593f90fed046ee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5F 5228 bytes
font_01_sfnt_off00007113.bin
5fd89d708451857ea707a81fa772a47ef4905b8bace2c19a6ced55403d236ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7113 9768 bytes

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