Malicious PDF — malware analysis report

Static analysis result for SHA-256 c286b56c84c7ba39…

MALICIOUS

PDF

35.2 KB Created: 2020-08-16 23:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec03f2b59ae918ae5304f4f8e95d2567 SHA-1: 1876ebfe74e9995254d3bf100258a76d9f19464e SHA-256: c286b56c84c7ba39231641b2442f1261a79706c914f1d5cccfaba84cf99ba4de
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector, which is a common technique for delivering malicious payloads. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=kailanan+ng+pang+uri+worksheets+grade+4', indicating a lure related to educational worksheets. The presence of numerous links to Shopify-hosted PDFs suggests a link farm or content-spinning operation to improve search engine visibility for malicious content. The ML classifier strongly flagged this PDF as malicious.

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=kailanan+ng+pang+uri+worksheets+grade+4 In PDF document text
    • http://files.kathrynmwhitesel.com/uploads/1/3/0/7/130739590/bolosubuzax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/zusej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7492/6230/files/mugobaroxuxuzavur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3509/7245/files/2901993167.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/gufabesu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46150969179.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7084/7131/files/33282997481.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/jakulejalalogupejer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/1057/5771/files/converter_para_jpg_ilove.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5750/4668/files/73845478254.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6592/3992/files/lulij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7319/1588/files/betadunexorikafedus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/5070/9671/files/fafsa_student_loan_deferment_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7304/4642/files/tuzuguwezozupuzitifipub.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ff4.bin
1b176448685e69b441bcc9a3cb4ba3db75d5ebbf61097e17d4b94688962fc23d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FF4 5432 bytes
font_01_sfnt_off0000627c.bin
8e4bcd316134e26f81ce39a6ba3ec473747a78a3acc29e2eeb3f2918becb4c5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x627C 8664 bytes

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